All three of his abilities (excluding his ultimate) have a form of CC, and he can get out of your ultimate by using his. However, he is a very visual champion regardless and you can usually tell when he's going to engage easily enough. Try to move around a lot when going for your passive so that you can avoid your W lockout.
Ashe
I rarely see Ashe as a support, but regardless of if she's the support or ADC, she's tricky to deal with. Mid to late game she'll be able to spam her W often which will make it hard to run away from her, and her R is on quite a low CD by that point as well. Something you can do is body block her R/arrows for your ADC and let them follow up, but this only really works if you're ahead and otherwise you should play the lane more aggressively to get 6 before her and shut her down.
Bard
This is totally dependent on what the Bard decides to do in all honesty. If he perma roams after the first few levels, you have a huge advantage once you and your ADC are level 6 so long as he's gone off to roam. However, he puts pressure on the rest of your lanes by doing so and pinging out when he's missing is crucial. Lane wise he is quite hard to deal with, his shrines give a decent amount of healing and you can't poke him down that well, plus he has easy escape with Magical Journey and also great engage with it as well as good chase potential. I generally recommend Shurelya's into this matchup so that you can outrun his portal.
Blitzcrank
I would personally just not even play Yuumi into this matchup. I have won against him before but only against very new Blitzcranks; a half decent one will be a nightmare and you will be under tower all game. This is a good ban choice as well, if you don't properly ward bushes it is pretty much impossible to do anything in lane. Also, be aware of the beginning of the game to NOT stand near the dragon pit or entrance bushes; it is a common Blitzcrank cheese strat to pull someone through the wall to kill them.
Brand
Just really obnoxious and super scales by late game, plus his ultimate is very teamfight reliant and helps his team win a majority of the time since it passes around to all enemies within range. His Q stuns targets as well so keep that in mind, though it is a skill shot so it's usually not hard to dodge.
Braum
I wouldn't consider Braum very difficult to deal with, however his shield will negate your ability to poke him and his ADC down so it can be an annoying lane. His passive will also apply a stun when it stacks 4 times, plus it will also do a decent amount of damage, so just be wary of that.
Janna
Ward bushes and she won't really be able to hit her tornadoes, since otherwise they'll usually be visible and you'll be able to dodge them. Her ult is just an AOE heal that knocks enemies back, so just don't be in range of her when her and her ADC are low since they could very easily follow up afterwards.
Karma
Recently nerfed in 11.16, you no longer really need to build Shurelya's against her as much since her MS on her shields was nerfed a ton. She has a bit more power on her Q, but she no longer gets Mantra cooldowns from her autos anymore either so she is a lot less oppressive in lane. Very easy to bait her root still and can punish her like any other enchanter should you not let her whittle you down for free.
Leona
Leona has CC on nearly every single ability and her hook goes through minions, leaving there to be no real counterplay as Yuumi unless you play far back and/or extremely smart. I really hate dealing with her and I haven't found an ideal way to go against her yet. Her roaming around the map will also be really annoying, especially if she runs Mobility Boots to get around for objectives as well.
Lulu
She can polymorph you and your ADC, and her polymorph is of course a form of CC so you need to be careful of that. She has a really low CD on her shields midgame and it will be hard to poke her. You ideally want to hit Qs by faking her out, aim it towards her ADC (who she'll usually shield) but then pivot it to her, switch, repeat. I will say however you must be careful going for all ins, her shields come up often enough for her to mitigate a lot of your ADCs damage and she can ult to interrupt briefly with a knockup, and if she's with a champ like Jinx or Kog'Maw (especially if they run Lethal Tempo) she will make them shred you both. Worthy of a ban in general right now due to her insane prowess.
Lux
She does an insane amount of damage with her ult and her E poke mid to late game though, so it's important to keep your ADC as healthy as possible in the event they get rooted. It's ideally best to focus her first in the lane because while she is meant to setup, she also dishes out arguably more damage than her ADC in less time, so get rid of her before engaging on them.
Maokai
I don't really know where to start with this scratching post. He has self heal, his tiny tree minions are really annoying, and he has quite a number of ways to CC both you and your ADC thanks to his ult, Q, and W. Mid to late game he will mostly heal off any poke or peel damage, so it's very hard to get to him with his team around thanks to his number of ways to setup around them. I don't generally recommend playing Yuumi into this.
Morgana
This is pretty skill dependent on the Morgana honestly. Her Black Shield has a high cooldown early game, but if she's going poke Morgana and trying to kill you and your ADC over time with her pool, she's a huge nuisance. If she's just trying to set up roots for her ADC, you can poke her out easily and make her have to continuously recall. Unfortunately she will likely build Liandry's and perhaps even Demonic if she does go for her poke/pool build, so you will really need to be careful late game not to get caught in her combos as you will 99% of the time die.
Nami
Her Q bubble has a 12 second cooldown early game so you have a good window of time to get your passive before it's up again, and this is her only form of CC besides her ult. She dishes out a pretty good chunk of damage though despite that, and has pretty good healing overall, so poking her out is going to be difficult. As she is also an enchanter, she too has the ability to enhance her allies' abilities, so it is generally safe to target her in the lane as without her, the ADC loses a lot of power.
Nautilus
He's very oppressive but only if he can land his hooks for the most part. If you hide behind minions and position well for your passive, he won't really have room to just hook you and single you out for free. Just don't get into melee range and you'll be fine, but in the event you/your ADC do get caught out by him, he's pretty much going to guarantee a kill on one or both of you, so play safe if possible.
Neeko
Her E is a snare that goes through minions and the longer it travels, the longer the root is. She can also turn into her allies and make very sneaky (quite literally) plays, and her ult is also a CC that gives her a temporary shield, plus she can hide her ult windup by disguising as an ally as well. Her Q burst damage is extremely surprising even at early levels, and she will generally oppress you and your ADC all lane. Due to her presence being quite rare though, she's not really a champion worth banning as she's mostly a comp-specific or OTP pick.
A little tip: you can auto attack her clone and get your passive off of it, so if you know it's the fake Neeko, use it to your advantage. That's the only real advantage to this lane though, unfortunately.
Pantheon
Point and click stun, extremely good sustain and the ability to poke with his Q as the range is pretty far. He also is extremely good at roaming with his ult and you will need to be aware of where he is at all times and pinging when he's missing. If you're lucky he will perma roam and allow your ADC to pressure and/or kill his, but most of the time he is just going to be a CC bot and poking you out and just being an overall nuisance.
Pyke
Really annoying to lane against due to the fact he can go invisible and surprise hook you, as well as follow up with his dash-stun and execute ult. He's not too bad pre-6 as his damage on his own is rather negligible, but his R is what makes him so scary since it doesn't matter if he's the one getting all the kills with it, his allies will get credit too. I would ban this guy if you feel like he's going to be an issue, especially if your team is entirely squishy champs as if he has someone fed to peel, he will likely just get a pentakill and win.
Rakan
Even though he has knockup CC and a charm on his R, I wouldn't say this is really unfavorable. If he is paired with Xayah, this lane becomes much harder though. He is very slippery and on his own does really 0 damage, so you can abuse him with pokes. Baiting out his knockup is the key here; it has a significant CD early game and is his main engage tool for his ADC, so preventing him from landing it is crucial to winning and snowballing the lane. Teamfights he will be looking to swoop around groups and use his R, so try to spread out more if possible to avoid him from charming everyone, similar to Seraphine (but much more slippery).
Rell
She is mostly a pick against tanks as she steals defenses from those she attacks, but against Yuumi she's very troublesome. Both parts of her W have CC and you need to be VERY cautious of positioning--putting yourself in between her and her ADC is not a good idea because if she casts E again, anyone inside of that will be stunned. Her R is also a stun that keeps enemies in her vicinity, so you need to try and ult before she does essentially. Despite this, she does suffer from being poked out of lane easily early game and she has no real form of range, so as long as you stay out her face there is a bit of an advantage to be had.
Renata Glasc
Renata's goal is to be an anti-engage champion with quite a lot of great peel for her carry thanks to her W, which essentially provides a chance for someone to live if they get a takedown before it runs out. However, something to note is that ALL of her main ability CDs are over 10 seconds long. If she misses her pull, which is her only CC besides her ult, then you should be taking aggressive trades with her and making her have to step back from you and your ADC. She only really shines in teamfights IMO and has no real threat for Yuumi or her carry in lane at all. Make sure to keep an eye out on if she starts Q (her pull) level one, as if she gets the level 2 advantage, she could very easily catch you out when you go for passive.
Senna
This used to be my permaban and there's a good reason why--her range, crit chance, and damage overall gets progressively worse as the game goes on, even as a support. Her healing is pretty typical and nothing special, but she has really high poke potential and her root is AOE so you and your ADC can potentially be caught in it, which is usually fatal. Also has a global ult and as a support that's just an absolute nightmare to deal with. All in all a good alternative ban if you feel like it's a hard matchup.
Seraphine
Outranges you by far, has the ability to root as well as CC with her ult, and generally superior healing and shielding as hers is a huge AOE circle. She is very easy to poke out in lane generally though, and if you can bait out her E (especially when it's double casting) then you can trade with her really well pre-6. Her ult is a bit of a challenge though; it's usually better to let your ADC get charmed and then follow up with your ult, since by then the charm will have ended and you can usually kill her should she be low enough.
Sona
This is pretty much a skill matchup, but generally Sona can't do much early game and you need to abuse that as much as possible. Late game she is going to be a bit of a pain thanks to her AOE healing (similar to Seraphine) so it would be wise to build Chemtech Putrifier somewhere down the line. She's generally just a poker who doesn't do much otherwise; do note her ult is a pretty linear stun though, which her ADC will follow up on, so it's important to follow up with your ult afterwards as to prevent them from doing anything off of it.
Soraka
Total skill matchup IMO. Same deal being that late game you want Chemtech Putrifier due to her global healing ult. Early game she's going to try and poke with her Qs, it's MUCH better to try and chip her down over her ADC since she can heal them but not herself, and she needs to use health to heal which is quite draining early game. She can be very oppressive and have a lot of say over teamfights though with her ult, so rushing Oblivion after your mythic is actually a good idea overall.
Swain
Very difficult matchup for Yuumi, if not one of her worst. Unfortunately he has a root that also allows him to pull anyone he roots back to him, allowing him to full combo in quick succession without much counterplay. Early game he's going to look to pick with autos and his pull, and mid to late game he has tons of sustain and is generally very hard to deal with. It's wise to rush Chemtech Putrifier here as well, and to play this lane more passively when possible; even without his ADC he can still very much 1v2.
Tahm Kench
Really out of meta right now, especially after his rework. His teleport that knocks up is rather short range and it is predictable due to you being able to see exactly where he comes up. If you're with a dash/blink champ such as Vayne/Ezreal, he will pretty much be useless except for saving his ADC, but otherwise getting his poke off is almost impossible. You can bully him pretty hard but being a tank he's not really the priority; his job is pretty much to take all of the poke and use his shields and devour to keep his ADC from dying. His slow can be quite obnoxious at times but that's about it, overall not a very scary thing to be going against right now.
Thresh
Hook supports are a nightmare and Thresh is no exception. A good Thresh will be a huge pain to deal with, both for his tankiness and the decently low CD on his hook (even early game; it's lower than Blitzcrank's for perspective). However, it is noticeable when he's going to throw his hook at the very least, so it is wise to try and bait it out from him--but BE CAREFUL. If you get hooked, he will 100% follow up and likely combo you with his ADC + Ignite and you'll be locked out of attaching, which is pretty much a guaranteed death.
Veigar
He's pretty meh in lane overall because he needs to scale up to become relevant most of the time, save for his cage in early skirmishes. A lot of Veigar supports tend to run Guardian with either a tankier build (Locket) or still try to be somewhat AP oriented (Everfrost) so keep an eye on his build path. Keep in mind of your positioning when you're W'ing back to your anchor because he can interrupt it with a well timed cage and engage on you with heavy burst thereafter.
Vel'Koz
This is an annoying lane due to Vel'Koz's obnoxious long range poke and knockup, as well as his laser on his ult, but he suffers from being poked out of lane as much as any other burst mage, and so long as you don't spoonfeed him the ability to poke you and your ADC down, you can win all-ins pre-6 pretty easily while his abilities are on CD, especially with jungle help. Try your best to avoid his knockup if you do go out for your passive and otherwise you should be okay, and do NOT let him stack his passive on you. Buying Shurelya's here is good to help your team better evade his ult.
Xerath
Super high damage, good late game scaling and a decent amount of CC--but it is a winnable lane. He's still very immobile and squishy, and therefore there are windows of opportunity to catch him out with your ult and periodically poke him back with Qs and autos. Early game is the best time to go after him as that's when he's at his most vulnerable, but anytime you can catch him alone, it's best to play aggressively since he only really shines when he can get a decent amount of range on the enemy.
Zilean
Very obnoxious more than anything, if he lands two bombs on you, you will be stunned and he and his ADC can very easily all-in you. His bomb poke damage is also quite annoying, and his ultimate even more so as it revives anyone he's cast it on (which can include himself). All-inning him with your ult and your ADC shouldn't be too hard when all of his CDs are down, but when he revives it's best to back off before re-engaging unless your ADC saved their ult to kill them and/or his ADC again. Paired with a poke ADC such as Caitlyn this is a pretty rough lane, but it isn't unwinnable by any means.
Zyra
Extremely annoying matchup; her plants will poke you and your ADC around and most Zyra's will run Arcane Comet making her poke similar to a Lux's. Also has a bunch of CC and by late game hits like a truck; you really need to make sure she can't contribute to teamfights and to get rid of her plants whenever they're up, otherwise she'll absolutely blow up your team.
Aphelios
High DPS synergy, especially late game, and your healing + his Red/White gun combo is insane together. If you can manage to pull it off, when he has his Purple gun, you should look to ult off of his root or ult root because it can create a massive CC chain and an opportunity for your team to win. Laning phase he tends to be a bit more passive, trying to poke out and keep sustain with his Red gun, but don't overlook how great he is of a carry late game, even if he doesn't do well early.
Ashe
Thanks to Ashe's amazing poke with her arrow wave, it is a really good lane for Yuumi and also with Yuumi on her, she can chase down enemies well with her arrows and her R, to which Yuumi can follow up with for a double root, which is pretty much always a guaranteed kill for Ashe. She also has amazing vision and her ult is global, letting her safely contribute to fights regardless of how far away she is or provide emergency vision.
Caitlyn
Caitlyn can follow up with her traps when you ult, making the enemies CC'd for a decent amount of time. Her damage output is also pretty strong, and her range is far superior to really every other ADC, allowing you to poke down the enemies very easily with her autos and your Qs. She also is a safe farmer and has an easy escape with her E, so you can safely rotate to the jungler if they ever need help too.
Draven
Early game bully reliant on a lead, he much prefers other champions with high engage but he can work fine with Yuumi if the enemies blindly overextend into the both of you. Try to push the wave with him to fight for level 2 if possible; he really can't be threatened early on by any other ADC, and you need to use this advantageously.
Ezreal
The bread and butter synergy, if your Ezreal is decent enough that is. Jokes (and minor salt) aside, a very potent combo. Nobody can ever catch up to you two thanks to the safety of his E and his innate Q range advantage to farm freely, and you both scale well into mid-late game. Helps Yuumi with a lot of her weaknesses too, especially into engage lanes, and generally just a good, chill partner to be with.
Jhin
Great synergy, although he prefers to have better engage. He can W off of your Q and get some good poke in, especially if he has a 4th shot prepared, but if you're into a hard engage lane, he does tend to suffer quite a bit. Try your best to poke with him and threaten the enemies off the wave, and you two will one shot people late game.
Jinx
Jinx is an extremely strong hypercarry and she scales really well if she can get ahead in her lane. Yuumi is great for her thanks to Jinx running Lethal Tempo and enabling her further, but I would say she prefers Lulu overall for that purpose (similar to Kog'Maw). Her passive makes her chase potential amazing, especially if you can heal her while she chases or ult enemies to keep them in place for her. Sadly her ult and yours don't have too much synergy, similar to Caitlyn, but you can help her poke down and kill enemies or get them trapped in a CC chain with her traps using your ult.
Kai'Sa
Highly prefers engage supports due to her inferior range to most other ADCs, and her taking Hail of Blades means she wants to take short, burst-oriented trades and back off. Her W poke is nice, but it is a pretty hard to hit skillshot in lane and she really doesn't want to sit back, and you also don't apply Plasma from her passive unless you ult which isn't ideal.
Kalista
Sadly there is nothing Yuumi can do for Kalista. Kalista can help her get out of sticky situations with her ult, but throwing a Yuumi at the enemy isn't generally a good idea. It CAN work if there is proper communication, since you could use her ult to throw Yuumi to follow up with hers, but most of the time it's better to play a tanky/engage support with Kalista.
Kog'Maw
Very good synergy. He has a pretty long range ultimate that reveals enemies, a slow, really good range on his W, and even lowers defenses on enemies he hits with his Q. His ult also is doubled against units below 40% health, so if you can get him fed, you can run really anyone down and he will be an unstoppable DPS monster. He favors enchantresses because they enable his attack speed further, and since Kog'Maw usually runs Lethal Tempo, enemies will be shredded before they even know what happened if Yuumi is with him, too.
Lucian
He's great overall due to the fact his passive favors shield-oriented enchantresses, but he does prefer to be aggressive still early game because that's when he shines best. You need to try and get level 2 first with him and take short trades, and if you can chunk the enemies enough with Qs and auto attacks, you can likely kill someone early or at least force Flash/Heal.
Miss Fortune
Decent synergy, depending on the build she goes. Her lethality poke build is super strong with you since you can easily follow up with an ult on her E and the build will chunk them heavily enough to force a Flash every time. Her regular crit build however takes some time to get online and requires more skill on her part more than anything.
Nilah
Not really as strong as you'd expect unfortunately. On paper she sounds great; strong all-ins, really good teamfighting with her ultimate, and a lot of upfront damage which Yuumi can help her with. The problem is that during lane, it feels impossible to play with her unless you are something aggressive, like a Nami, Nautilus, Leona, etc. - Melee carries benefit a lot more from aggression because they need to get an early lead before they're outscaled by a marksman, but this can still work if you can manage to find a way to get one.
Samira
This lane can work out really well if the Samira is good at the champion, since rooting the enemies in her ult is 99% of the time a double kill thanks to how strong Samira is right now. However, Samira ideally would do better with someone like Rell or Thresh as she can double engage with her dash, but Yuumi can also do the job for her should she be the support. I would recommend playing this lane with someone you know more than anything, as it requires a decent amount of communication with how quick Samira is.
Senna
Just not good together at all. Senna really wants to have a tank to farm for her while she takes Spectral Sickle, and Yuumi doesn't fulfill that role for her at all. They both scale insanely well together, but Senna can't do anything in lane as she has no protection and has to be constantly threatened.
Seraphine
Great synergy, Seraphine can also heal off of Yuumi's passive or Aery shield which is an amazing trait to have in teamfights especially. If she goes enchantress, you should ideally build whichever mythic she doesn't (i.e. build Shurelya's if she goes Moonstone and vice versa) since you'll be super potent together, but if she goes AP then just build normally.
Sivir
Her rework made her an insane carry, and Yuumi loves playing with her as well. She clears waves faster than enemies can react, she has almost unmatched poke with her Q and W bounces, and her ultimate is one of the best teamfighting tools in the game.
Swain
Amazing ultimate, great sustain, and can pull one or both enemies back towards him to dish out damage. A really good APC overall and with a Yuumi he is arguably unstoppable. You can follow up with really all of his abilities and you both poke insanely well, so you can pressure the enemies out early and get ahead in levels and CS.
Tristana
Tristana likes to go for all ins very early, and thus it is a good idea to poke out with your Q as much as possible for her in the event she wants to go in. Something to also know is that her Rocket Jump resets when she kills an enemy, so this is fantastic for post-6 especially as she can jump in, you can ult, she kills the first enemy, then jumps to the next if they try to flash/escape. Really good combination if played well, and her late game DPS and objective sieging is nothing to put aside.
Twitch
The reason this duo is the scariest and by far one of the best is due to how Twitch is a scaling late-game assassin. With Yuumi he can poke out enemies with her as well as have the element of surprise thanks to his invisibility and Yuumi's ult. Enemies can't react to what he does and especially not with how much sustain he'll have once Yuumi gets her first item and ultimate. The ideal duo botlane for Yuumi!
Varus
These two are really good together as well and his ult is a root, so you can follow up on that with yours. He deals a surprising amount of damage early game, plus when fully charging his arrow he can really scare the enemies away. He does suffer from the typical no escape ADC archetype though, so do try to ward around for him, especially because his ult cannot CC more than one champion.
Vayne
Another hypercarry, she loves having enchanters and/or engage since both will help her scale very well. Having true damage in her kit allows her to assassinate tanks as well as squishy enemies and once she gets her third item, she is an unstoppable monster. Also has built in dashes, invisibility, and great damage/attack speed. What's not to love?
Veigar
Late game scaling monster, but do note that his laning phase isn't really the best and he can suffer a lot early game. Try your best to poke and sustain for him and just let him farm the lane out with his Q, if he isn't punished for it and is given enough time and passive stacks, he will be absolutely unstoppable.
Xayah
This is a pretty average synergy overall and Yuumi does help Xayah a lot since Xayah lacks really any chase potential, and Yuumi's speed will help her a lot with that. I think this synergy is skill dependent more than anything; if Xayah can place her feathers well and dish out a lot of damage with her E, this can be a great lane. Otherwise, you're likely to get pushed under tower all game and she'll be forced to farm while you'll eventually have to roam.
Zeri
Very good synergy. Zeri loves enchanters, especially ones with shields (Aery does count, keep in mind) because they give her MS and Yuumi is no exception. She is insanely mobile and has an ability akin to Bard's portal where she can skate across walls, so being able to take Yuumi with her is huge. You can enable her greatly and allow her to kite even faster, and this is generally a great mid to late game pairing in general.
Ziggs
Not too common in the botlane, but ZIggs is a great APC with even better poke damage. You can help him whittle down enemies easily and his bombs have pretty good range, which will stop the enemy ADC/APC from being able to CS really at all. You can also help him land his ult a lot easier with yours and his follow up damage will pretty much always guarantee death.
Synergies
IdealStrongOkLowNone
Aphelios
High DPS synergy, especially late game, and your healing + his Red/White gun combo is insane together. If you can manage to pull it off, when he has his Purple gun, you should look to ult off of his root or ult root because it can create a massive CC chain and an opportunity for your team to win. Laning phase he tends to be a bit more passive, trying to poke out and keep sustain with his Red gun, but don't overlook how great he is of a carry late game, even if he doesn't do well early.
Ashe
Thanks to Ashe's amazing poke with her arrow wave, it is a really good lane for Yuumi and also with Yuumi on her, she can chase down enemies well with her arrows and her R, to which Yuumi can follow up with for a double root, which is pretty much always a guaranteed kill for Ashe. She also has amazing vision and her ult is global, letting her safely contribute to fights regardless of how far away she is or provide emergency vision.
Caitlyn
Caitlyn can follow up with her traps when you ult, making the enemies CC'd for a decent amount of time. Her damage output is also pretty strong, and her range is far superior to really every other ADC, allowing you to poke down the enemies very easily with her autos and your Qs. She also is a safe farmer and has an easy escape with her E, so you can safely rotate to the jungler if they ever need help too.
Draven
Early game bully reliant on a lead, he much prefers other champions with high engage but he can work fine with Yuumi if the enemies blindly overextend into the both of you. Try to push the wave with him to fight for level 2 if possible; he really can't be threatened early on by any other ADC, and you need to use this advantageously.
Ezreal
The bread and butter synergy, if your Ezreal is decent enough that is. Jokes (and minor salt) aside, a very potent combo. Nobody can ever catch up to you two thanks to the safety of his E and his innate Q range advantage to farm freely, and you both scale well into mid-late game. Helps Yuumi with a lot of her weaknesses too, especially into engage lanes, and generally just a good, chill partner to be with.
Jhin
Great synergy, although he prefers to have better engage. He can W off of your Q and get some good poke in, especially if he has a 4th shot prepared, but if you're into a hard engage lane, he does tend to suffer quite a bit. Try your best to poke with him and threaten the enemies off the wave, and you two will one shot people late game.
Jinx
Jinx is an extremely strong hypercarry and she scales really well if she can get ahead in her lane. Yuumi is great for her thanks to Jinx running Lethal Tempo and enabling her further, but I would say she prefers Lulu overall for that purpose (similar to Kog'Maw). Her passive makes her chase potential amazing, especially if you can heal her while she chases or ult enemies to keep them in place for her. Sadly her ult and yours don't have too much synergy, similar to Caitlyn, but you can help her poke down and kill enemies or get them trapped in a CC chain with her traps using your ult.
Kai'Sa
Highly prefers engage supports due to her inferior range to most other ADCs, and her taking Hail of Blades means she wants to take short, burst-oriented trades and back off. Her W poke is nice, but it is a pretty hard to hit skillshot in lane and she really doesn't want to sit back, and you also don't apply Plasma from her passive unless you ult which isn't ideal.
Kalista
Sadly there is nothing Yuumi can do for Kalista. Kalista can help her get out of sticky situations with her ult, but throwing a Yuumi at the enemy isn't generally a good idea. It CAN work if there is proper communication, since you could use her ult to throw Yuumi to follow up with hers, but most of the time it's better to play a tanky/engage support with Kalista.
Kog'Maw
Very good synergy. He has a pretty long range ultimate that reveals enemies, a slow, really good range on his W, and even lowers defenses on enemies he hits with his Q. His ult also is doubled against units below 40% health, so if you can get him fed, you can run really anyone down and he will be an unstoppable DPS monster. He favors enchantresses because they enable his attack speed further, and since Kog'Maw usually runs Lethal Tempo, enemies will be shredded before they even know what happened if Yuumi is with him, too.
Lucian
He's great overall due to the fact his passive favors shield-oriented enchantresses, but he does prefer to be aggressive still early game because that's when he shines best. You need to try and get level 2 first with him and take short trades, and if you can chunk the enemies enough with Qs and auto attacks, you can likely kill someone early or at least force Flash/Heal.
Miss Fortune
Decent synergy, depending on the build she goes. Her lethality poke build is super strong with you since you can easily follow up with an ult on her E and the build will chunk them heavily enough to force a Flash every time. Her regular crit build however takes some time to get online and requires more skill on her part more than anything.
Nilah
Not really as strong as you'd expect unfortunately. On paper she sounds great; strong all-ins, really good teamfighting with her ultimate, and a lot of upfront damage which Yuumi can help her with. The problem is that during lane, it feels impossible to play with her unless you are something aggressive, like a Nami, Nautilus, Leona, etc. - Melee carries benefit a lot more from aggression because they need to get an early lead before they're outscaled by a marksman, but this can still work if you can manage to find a way to get one.
Samira
This lane can work out really well if the Samira is good at the champion, since rooting the enemies in her ult is 99% of the time a double kill thanks to how strong Samira is right now. However, Samira ideally would do better with someone like Rell or Thresh as she can double engage with her dash, but Yuumi can also do the job for her should she be the support. I would recommend playing this lane with someone you know more than anything, as it requires a decent amount of communication with how quick Samira is.
Senna
Just not good together at all. Senna really wants to have a tank to farm for her while she takes Spectral Sickle, and Yuumi doesn't fulfill that role for her at all. They both scale insanely well together, but Senna can't do anything in lane as she has no protection and has to be constantly threatened.
Seraphine
Great synergy, Seraphine can also heal off of Yuumi's passive or Aery shield which is an amazing trait to have in teamfights especially. If she goes enchantress, you should ideally build whichever mythic she doesn't (i.e. build Shurelya's if she goes Moonstone and vice versa) since you'll be super potent together, but if she goes AP then just build normally.
Sivir
Her rework made her an insane carry, and Yuumi loves playing with her as well. She clears waves faster than enemies can react, she has almost unmatched poke with her Q and W bounces, and her ultimate is one of the best teamfighting tools in the game.
Swain
Amazing ultimate, great sustain, and can pull one or both enemies back towards him to dish out damage. A really good APC overall and with a Yuumi he is arguably unstoppable. You can follow up with really all of his abilities and you both poke insanely well, so you can pressure the enemies out early and get ahead in levels and CS.
Tristana
Tristana likes to go for all ins very early, and thus it is a good idea to poke out with your Q as much as possible for her in the event she wants to go in. Something to also know is that her Rocket Jump resets when she kills an enemy, so this is fantastic for post-6 especially as she can jump in, you can ult, she kills the first enemy, then jumps to the next if they try to flash/escape. Really good combination if played well, and her late game DPS and objective sieging is nothing to put aside.
Twitch
The reason this duo is the scariest and by far one of the best is due to how Twitch is a scaling late-game assassin. With Yuumi he can poke out enemies with her as well as have the element of surprise thanks to his invisibility and Yuumi's ult. Enemies can't react to what he does and especially not with how much sustain he'll have once Yuumi gets her first item and ultimate. The ideal duo botlane for Yuumi!
Varus
These two are really good together as well and his ult is a root, so you can follow up on that with yours. He deals a surprising amount of damage early game, plus when fully charging his arrow he can really scare the enemies away. He does suffer from the typical no escape ADC archetype though, so do try to ward around for him, especially because his ult cannot CC more than one champion.
Vayne
Another hypercarry, she loves having enchanters and/or engage since both will help her scale very well. Having true damage in her kit allows her to assassinate tanks as well as squishy enemies and once she gets her third item, she is an unstoppable monster. Also has built in dashes, invisibility, and great damage/attack speed. What's not to love?
Veigar
Late game scaling monster, but do note that his laning phase isn't really the best and he can suffer a lot early game. Try your best to poke and sustain for him and just let him farm the lane out with his Q, if he isn't punished for it and is given enough time and passive stacks, he will be absolutely unstoppable.
Xayah
This is a pretty average synergy overall and Yuumi does help Xayah a lot since Xayah lacks really any chase potential, and Yuumi's speed will help her a lot with that. I think this synergy is skill dependent more than anything; if Xayah can place her feathers well and dish out a lot of damage with her E, this can be a great lane. Otherwise, you're likely to get pushed under tower all game and she'll be forced to farm while you'll eventually have to roam.
Zeri
Very good synergy. Zeri loves enchanters, especially ones with shields (Aery does count, keep in mind) because they give her MS and Yuumi is no exception. She is insanely mobile and has an ability akin to Bard's portal where she can skate across walls, so being able to take Yuumi with her is huge. You can enable her greatly and allow her to kite even faster, and this is generally a great mid to late game pairing in general.
Ziggs
Not too common in the botlane, but ZIggs is a great APC with even better poke damage. You can help him whittle down enemies easily and his bombs have pretty good range, which will stop the enemy ADC/APC from being able to CS really at all. You can also help him land his ult a lot easier with yours and his follow up damage will pretty much always guarantee death.
Hi there, my in-game name is Mementos (previously Korippo), but my friends call me Vivi. I am a Yuumi player amassing over 500k+ points on the cat now, and I have played League since January 8th, 2021, so the very first day of Season 11. I was interested in the game for years but never truly got into it since it seemed like it had quite a hard learning curve, but one day I just gave it a try thanks to the recommendation of my friend and now it's my favorite game!
I started playing Neeko midlane only to find that I'm really not as into the role as I thought. Then I tried Lux support, and one day I looked through the shop and thought Yuumi was cool, so I bought her. Ever since then I have been playing her and having a lot of fun on the Rift! I also love playing other champions such as Kindred, Lillia, Anivia, Veigar, and many more.
I also must add that I am not necessarily a Yuumi OTP either as I enjoy playing other lanes and champions from time to time just as much as support/Yuumi, so I do not fully put all of my time on the game into the champion. I am still very passionate about her, but I also use my knowledge about other lanes/champions to assess how she can play better in the game too. :)
As of 5/13/2022 these are my stats on Yuumi, for tax:
I hope that my guide can teach you about Yuumi and that it can help you pick up the magical cat we all know and love!
Pros & Cons
PROS
Untargetable when on an ally, and if on a tanky/fed ally can be essentially unkillable
Great poke, can zone out the enemy laners and allow your ADC to CS more effectively--enemies will learn at some point that you will walk up to them for your passive and mana sustain, so they will generally run away from you when you try, which is good pressure!
Extremely good healing mid to late game, you can pretty much heal any squishy champ from half health and get everyone prepared to contest objectives
Low CD ultimate late game thanks to majority if not all of your items passively building up ability haste, even early game it is very low CD compared to some other ultimates which will allow you to set up ganks
CONS
Very squishy and is essentially a free kill if she's caught out alone; this is where her stereotype of "half a champion" mainly comes from
Is very susceptible to CC of any kind as it locks her out of her attach, and you need to be hyper aware of all CC threats in teamfights as to not get yourself killed. You are often the key link to teamfights due to the sustain you provide, if you misstep and die it could lose you the fight entirely
Can be countered by antiheal, and if a fed enemy laner that has AOE abilities builds it, you aren't going to be able to provide as much for your team besides your ultimate and Q poke
She is very easily punished if you are not keeping yourself aware of CC threats and champions who can quickly 100 to 0 you in teamfights, which is why getting your passive in fights is generally a bad idea and will lose you fights entirely if you make even one misstep. Enemies are in the end waiting for you to get off as they know the sustain you provide, so you must be smart about when you decide to hop off
Yuumi is considered a mid to late game champion due to her lack of much early game power. Once she gets her mythic, her mana sustain is typically much better and she holds a lot more value in both lane and roaming. Pre-6 her job is mostly to poke down enemies with Prowling Projectile and keep getting her Feline Friendship to sustain in lane until she and her ADC can back. It is generally favorable for your jungler to gank post-6, as before then you likely have no CC in lane (unless you're with someone like Ashe or a mage APC such as Veigar) and it will be hard to get ganks off.
Abilities
Prowling Projectile is Yuumi's bread and butter for laning phase. When attached, you can freely move her projectile around a designated area, and if you keep it flying long enough, it will become empowered and deal more damage while also slowing enemies. If you use this ability while not attached, the projectile will shoot in a straight line instead.
You and Me! is Yuumi's attach. She gets this ability by default at level 1 alongside being able to level either Prowling Projectile or Zoomies. Any shield that Yuumi gets from her passive will apply to an ally she attaches to, otherwise herself. Any ally she attaches to will give her more Adaptive Force and her ally will also gain a part of her Adaptive Force, which applies to the build of your ally specifically.
Zoomies is Yuumi's heal ability, which is either applied to herself or the ally she's attached to. The cost of this ability is totaled by her max amount of mana, which is why you want to stay away from building mana items as much as possible since it will make this more costly no matter how much sustain you have. Zoomies also gives movement speed when used, so you can use it both to save low health allies or get them out of sticky situations.
Final Chapter is Yuumi's ultimate ability. Any enemy caught inside of it and hit by 3 consecutive waves will be rooted for a brief moment, which is a great combination with other CC abilities. You can use this to set up ganks, or use it to root enemies in huge 5v5 teamfights to give an instant advantage to your team by locking down priority targets.
Drafting in Champ Select
One of the core things people always ask when trying to play Yuumi is when she is viable in a team composition, what she shouldn't be picked against (if not first pick) and many more questions. Generally I try to rule out the following when deciding to play Yuumi in a match:
- Do we have at least one frontliner? If not, a tank support may be better--lacking any sort of tank or otherwise frontline bruiser will hinder your teamfighting a lot and Yuumi won't be able to continue keeping sustain if nobody has the HP to take tons of damage. Exceptions to this would include champions like Sylas who, while squishy, in theory has infinite sustain if the enemy team doesn't build something like Morellonomicon or Mortal Reminder.
- Is our ADC on role? This seems strange, but here's the thing--people generally will play well with any support should they be on role as an ADC. If people don't understand the role, they won't play with Yuumi well as they need to understand lane states, matchups, and the like for the lane to go smoothly. Some people when they are autofilled ADC just play passively all game as well, negating your ability to poke with Q (and, sometimes frustratingly enough, your Manaflow Band stacks for the first 10 minutes of the game). Always facecheck your teammates!
- Does the enemy team have full CC? This isn't necessarily an end all be all if you are hyper aware of pretty much all champions' abilities in the game, but if you look at the composition and it consists of something like:
It may generally be better to not play her into it unless you feel your composition wins their lanes and will negate their ability to contribute. Unfortunately, there are so many champions with CC that it is pretty much impossible to guarantee a match where someone doesn't have any, so often times you will just have to play them out and learn when to engage and when to not based on the enemy's cooldowns.
You also want to highly consider your team and whether they benefit from an enchanter overall or not. If you can reliably peel for someone or look at a matchup and think that it will be a very favorable lane for them, then an enchanter is always going to be amazing simply because the ability to keep an ally alive constantly is very strong. I also like to consider my jungler more than any other lane, playing with Nunu & Willump and Rammus for example are really fun because your combined mobility gets you both around the map extremely fast, plus they are great tanks to have anyways. Lillia and Kayn are also good examples.
Laning Phase/Early Game
Yuumi's early game is something that takes a lot of getting used to. She has a very weak start in the lane until level 6 and therefore is described as being rather passive, but you can still dish out quite a bit of damage with proper Q pokes. I generally always start with my Prowling Projectile level 1, but if the matchup is not in our favor and there's fear of a level 2-3 all-in, starting Zoomies is viable as well. I would much rather get my Manaflow Band stacks off with my Prowling Projectile poke earlier than later though, since this will make a difference for our mana regeneration and help us stay in lane longer.
You also want to be getting your passive Feline Friendship as much as possible as early game it will also be your main source of mana sustain. You proc it by auto attacking, so be very vigilant in CC heavy lanes to determine their cooldowns and only hop off when you see opportunities to get it without being caught out. Early levels pretty much all hook or heavy CC champions have high CDs, so this is generally not too hard to figure out anyways. The shield is also good against poke heavy laners like Lux and Morgana and will negate some of their damage early on.
Depending on who you're laning with, your early levels will differ drastically. Say for example you're laning with a Twitch, a very favorable synergy for you! He is a late game hypercarry assassin, but he does have good early game power if played well. You generally always want to go for the ADC over the support, unless the support is a very high DPS burst mage (such as Zyra) who can deal the same if not more damage than her ADC, then you should be whittling them both down equally. If you're laning VS an enchanter such as Soraka it generally is better to get them low, as it will make them use their mana more and make them have to back earlier, leaving their ADC vulnerable.
The goal of laning with Yuumi is to provide a lot of poke damage with Prowling Projectile and to get your passive Feline Friendship off as much as possible to sustain until your ADC can back for items. It's important to remember your passive, there are a ton of new Yuumi players who neglect it and it will cost you a lot of times if you don't proc it when possible. Ideally you never want to leave your ADC alone in lane unless they are a super safe laner such as Ezreal, but even then I try not to as some matchups are easy to tower dive with.
Mid-game/Roaming
At around 15:00 or once your botlane tower falls, you and your ADC will generally rotate to the midlane since it is the safer option for the both of you to be in the middle of the map. Playing as Yuumi however, this is your time to analyze your team and understand your win conditions as well as see who is doing the best on your team. As we likely all know, our ADCs aren't always the fed carries we wish they were, and so as Yuumi you should instead stick with whoever is carrying to help them continue doing so.
Yuumi loves playing with tanks, bruisers and assassins due to her ability to keep them frontlining or add onto their already great mobility. Tanks and bruisers have a lot of health and sustain to begin with, so Yuumi only amplifies this further and gives them a huge damage boost. For assassins, as they love an in-and-out playstyle, Yuumi can contribute by keeping their health tipped off and speeding them up for chases, especially with Shurelya's Battlesong. I personally love playing with Garen, Darius, Mordekaiser, Katarina, and Akali for all of these reasons, and I have very easily helped them carry us to victory so many times. She also does fantastic with invisibility or clone champs like Shaco and LeBlanc because she can attach to their clone to further confuse enemies and baiting them into bad plays.
You pretty much will just be assisting your carries at this point in the game and making picks to secure objectives like the Dragon Soul, Elder Dragon and Baron Nashor to push for victory. You can also help a laner splitpush and continue putting pressure on multiple places in the map.
Teamfighting is where you will shine the most though as Yuumi, once you figure out who exactly is the priority to keep alive, you want to stick with them and keep healing them, as well as looking for good opportunities to get a huge Final Chapter off. Your ultimate is amazing especially for river skirmishes over drakes, since you can either use it to pick off the jungler or other priority targets as well as do some fun dragon steals. Getting Feline Friendship is rather hard in teamfights, which is why we opt to take Presence of Mind and why I preach it so much; you REALLY will need it in some of your longer skirmishes and it will enable you further to protect your carries and spam Zoomies more oftne.
Warding and Vision
Vision control is an absolute necessity on every single champion in the game, but supports are the champions that mainly fulfill that task in keeping every nook and cranny lit up so that your team doesn't facecheck everything and die to bad plays. However, there is a big difference between good and bad wards, and learning where exactly to ward is extremely vital.
In the beginning of the game, your support item won't provide you with any wards and thus you're left carrying around your Stealth Wards to use for now. In general during laning phase, you have a few options of using these wards--if you are against poke threats that are bush camping, then warding the middle bush in lane is best so that you can consistently see when they walk in and out of bushes. Otherwise, try warding the river bush leading into your lane, either beside the pit or to the entrance of the river work; but generally you want to ward the closest bush if you are pushed/behind, and the farthest if you are ahead, that way you can foresee enemy ganks.
The biggest rule of thumb for supports as well is to always carry around a Control Ward on you. If you have one on the map already, that's great, but you want to try and have one equipped on you to clear out nearby wards, too (remember that Control Wards also reveal nearby Stealth Wards, so use that advantageously on objective sieging) and to also replace your previous Control Ward for a better situational one.
After you finish your first support quest and get your Frostfang, you want to immediately switch from Stealth Wards to Oracle Lens. This is because by the time your quest is done, you will either be near or at mid game which is when you and your ADC will start to roam around the map more, and you want to clear out vision in order to make picks and also get vision control of your own. I generally aim for a 50+ vision score per game, averaging around 2 vision score per minute if I can. This will of course vary dependent on many game factors, but vision wins games, and don't take it for granted, but also don't overextend for it.
As Yuumi you will have almost no real opportunities to roam for vision on your own or make any deep wards unless you have someone with you, which is why your vision score can fluctuate a lot in the transition from early to mid game. Some supports excel at getting in and out of the enemy jungle for very deep wards ( Bard is a token example of this) so you want to try and sweeper through your own jungle if you feel like they were nearby, otherwise your jungler will fail all of their ganks before they even plan them.
Yuumi F.A.Q. / Niche Tips
1. Can I carry games with Yuumi?
The short answer to this is kind of. At the very least, you can continue to help an ally attempt to carry the game, but in the event an enemy laner is something like 20/3/10 and none of your teammates have a positive KDA, it is unlikely to carry the game yourself from there. You can encourage your teammates to farm up and perhaps flank the carry of the enemy team to try and secure a kill when you have ult and exhaust/ignite up, but it is still going to be very hard nonetheless. Due to Yuumi needing teammates as well, her solo carry potential isn't really viable to count on. She can KEEP a carry alive, but she can't necessarily be the carry in terms of damage herself. The point of playing any enchantress is to amplify your team to get ahead, and you most of the time don't really have the damage or the tools to do that yourself, unfortunately.
2. If banned, what other champions are worthwhile learning that play similarly to Yuumi?
No other champion is truly like Yuumi, but she is an enchantress and thus you will find success in mimicking her playstyle by playing her enchantress counterparts (such as Nami, Janna, Lulu, Soraka) -- most people will agree however that Sona likely plays the closest to her as she has pretty much all of Yuumi's kit besides her ability to attach. All of these champions have different uses and play styles however, so be prepared to learn a few of them due to Yuumi's ban rate fluctuating as you rank up if you don't want to play any other type of support.
3. Am I going to receive hate for playing the champion?
Most of the time I don't usually have much issue playing Yuumi with my team, however some ADCs will be rather dissatisfied with the choice. At the end of the day, play whatever champion you want, your team is free to dodge the game if they don't like the choice. Remember that Yuumi was nerfed long ago in her heal mana cost to make it so that her passive was an absolute necessary part of her laning phase, so the "AFK cat" argument these days is rather invalid. Don't let other people ruin your experience in game, after all.
Some niche tips/tricks about Yuumi and opponents/teammates
(Will update as I think of/learn more)
- You need to be very wary of playing alongside Mordekaiser or against one--either way when using his ult, if you're attached to him, you'll often get dropped into the middle of the enemy team and killed as a result. Similarly, if you are against one and he ults your carry, the same can happen there, so be very mindful of his CDs and play around them as to not get caught.
- If you happen to be playing against a champ with a clone, such as Neeko or Shaco, note that you can auto attack their clone to get your passive just the same as a regular champion. It's a small thing to know, but it can sometimes come in a pinch.
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