Hello,i m ShockMaster and i play Kennen since season 6,i played a lot of matches with Kenny and i mastered him with 600 k points. My highest rank was Plat 1,playing only Kennen mid from bronze 1 to plat 1. In this new season i achieved plat 5,and i m gonna catch diamond quickly,maybe more :) Note: Now i am plat 2,using just this advices for you guys =)
Edit: I finally get my first season when i reached Diamond 5 playing only Kennen and Gnar <3

Hello! I haven't updated this guide for 2 years and the meta changed a lot. That doesn't mean that you can't play with Kennen on mid! After 5 seasons, I will show you the best guide so you can climb easier.

Sorcery I use this rune page first for the Damage and CD reduction,which is the most important on Kennen.
Summon Aery,this KeyStone is the best one right there,your poke is important and you can t wait for Electrocute cooldown.
The Ultimate Hat help you a lot with his Slicing Maelstrom cooldown,which is very good
Celerity best one,great combination with Lightning Rush which gives you a good movement speed and ap at teamfights
Scorch is very good with Thundering Shuriken,i usually rush it as last rune
Second Tree
Nimbus Cloak Replaces now the removed The Ultimate Hat Rune. You have to choose this rune, being essential to a speed-driven champion like Kennen,which is very important in teamfights.
Domination These runes gives you a bigger powerspike than the Inspiration runes.
Taste of Blood replaces the old start on Kennen with old runes and Doran Blade,giving you sustain.
Ultimate Hunter is like the old The Ultimate Hat. This rune helps you a lot with CD reduction,depending on how many Takedowns you make.

I played 300 matches with these items and it s guarented the best build.I m also sad for the old Rilay with 100 ap and 400 hp...but i can t include it in this build right now. Hextech Rocketbelt helps you a lot with a good engage at teamfights,surviability and nice active.I always buy Sorcerer's Shoes but if you prefer more of a deffensive choice you can choose Mercury's Treads or Ninja Tabi. 2 nd item core is not other than Liandry's Anguish,another item with ap,good passive and hp for tankiness. Next you buy a deffensive one, Zhonya's Hourglass vs AD team,and Banshee's Veil vs Ap team.



UPDATE: I will keep this build for u guys...cause this build was one of the best
UPDATE:I'm back,this is the new build i usually use: Hextech Rocketbelt is still the core item on Kennen,which help you a lot with ap,hp,cooldown passive and with his active,cause you can make your ult more large with it. Sorcerer's Shoes help you with movement speed and magic pen,magic pen is esentially very important for Kennen. Next you have 3 options,which depends on the phases of the match: If you are VERY AHEAD WITH LIKE 5/0 Spellbinder is the best item to play with,he gives you a big advantage in teamfights when you use it,cause he give you 100 Ap and 30% movement speed for 4 seconds. If you are still ahead,but you are not sure you can melt enemies very good,you can use new
Morellonomicon,he gives you HP for sustain in lane,ap and magic pen most esentially things for Kennen + he is a very good item against champs with big HP regen,like Vladimir, Swain or Soraka with Grievous Wounds effect.If the enemies are so squishy,you can buy Spellbinder and Morellonomicon in same build.After you have to buy at your decision,if you think the teamfights are too hard,buy a deffensive item,like Zhonya's Hourglass against Ad champs or Banshee's Veil against Ap champs.You have to buy Rabadon's Deathcap in late game,this item gives you a lot of ap in late =) Do not forget Void Staff,this item helps you a lot against high magic resist comp enemies
General build (normal matchup) Hextech Rocketbelt, Sorcerer's Shoes, Morellonomicon, Zhonya's Hourglass OR Banshee's Veil, Void Staff and Rabadon's Deathcap
The melt build (only if you are ahead):
Hextech Rocketbelt, Sorcerer's Shoes, Spellbinder, Morellonomicon, Void Staff and Rabadon's Deathcap
Note: The melt build is very good in late game, Rabadon's Deathcap with Spellbinder grant you enough ap to melt enemies in late game.
Note: Shurelya's Battlesong is a very good item at the moment on Kennen,which helps a lot with movement speed against heavy cc comp enemies,you can use it in combination with Spellbinder,to maximize his movement speed.

Slicing Maelstrom max at every single time ur ult,is the first central damage right there
Thundering Shuriken max that second cause this ability is the second central damage power core
Electrical Surge Since,ur Lightning Rush should be maxed last,cause Electrical Surge gives you more damage

Kennen's abilities add Marks of the Storm to opponents, which last for 6 seconds. The marks are consumed at three stacks, stunning the opponent for 1.25 seconds while restoring 25 Energy. If the same target is stunned more than once within 6 seconds, the stun lasts only 0.5 seconds. This passive is actually super strong, crucial in laning phase, and must be given close attention in order to secure a kill. It's Kennen's only form of stun, and flows really well with his kit, and when combined with Slicing Maelstrom, his ultimate, it basically becomes an area of effect stun.

Cost: 60/55/50/45/40 Energy.Range: 950

Kennen throws a fast moving shuriken towards a location, causing damage and adding a Mark of the Storm to any opponent that it hits.Throws a shuriken that deals 75/115/155/195/235 (+75% Ability Power) magic damage to the first enemy it hits. Thundering Shuriken is a basic ability,try to hit as many as these as you can in lane. If you catch one of Thundering Shuriken,try to use Electrical Surge and if you think you are able to kill enemy use your Lightning Rush to stun the enemy This ability helps you a lot when you are against a heavy hard matchup,to play passive

Cost: 40 Energy Range: 725

Kennen passively deals extra damage and adds a Mark of the Storm to his target every few attacks, and he can activate this ability to damage and add another Mark of the Storm to targets who are already marked. Passive: Every 5 attacks, Kennen deals bonus magic damage equal to 15/20/25/30/35 (+0) (+30% Ability Power) and adds a Mark of the Storm to his target. Active: Sends a surge of electricity through all nearby enemies affected by Mark of the Storm or Slicing Maelstrom, dealing 65/95/125/155/185 (+55% Ability Power) magic damage. Electrical Surge passive helps you a lot with a mark of your passive,and for some nice damage.In lane it's just used after hitting a Thundering Shuriken for some added damage, unless you're trying to stun to get a kill.In teamfight you must use this ability in combination with Slicing Maelstrom

Range=200 Cost:100/95/90/85/80 Energy

Kennen Kennen morphs into a lightning form, enabling him to pass through units. Each enemy unit he touches takes damage and receives a Mark of the Storm. Kennen doubles his base movement speed and ignores unit collision for 2 seconds, dealing 85/125/165/205/245 (+80% Ability Power) magic damage to any enemy he passes through. Additionally, Kennen will gain 10/20/30/40/50 Armor and Magic Resist for 4 seconds.Kennen gains 40 Energy the first time he passes through an enemy.Lightning Rush deals half damage to minions. Lightning Rush This ability, when used correctly,is very good. It's a much needed mobility ability and makes Kennen pretty hard to gank or get caught while also having the ability to be used for wave-clearing; You can just dash through all the minions, and then use Electrical Surge on them all.

Cost: No Cost,Range: 550

Kennen summons a storm that strikes at nearby enemy champions for magical damage. Summons a magical storm for 3 seconds that deals 40/75/110 (+20% Ability Power) magic damage to all enemies near Kennen every 0.5 seconds. Each maelstrom hit applies Mark of the Storm, up to a maximum of 3.Successive maelstrom hits against the same enemy deal an additional 10% damage for each hit they've already suffered from this storm. Slicing Maelstrom This ult is the key for winning the most of the games,i swear.When i losed a match with Kennen That was because i was a little bit behind with the other champs,or i didn t use my ult when Slicing Maelstrom was on cd This ability is like a circle of death for your enemy. Your stacks of Mark of the Storm applied with Slicing Maelstrom. Since it applies the stacks from Mark of the Storm, when combined with Electrical Surge, or sometimes even just on it's own, it can become a massive area of effect stun. Use your Lightning Rush combined with your Flash and with your Slicing Maelstrom which makes it much easier to get huge ultimates. I usually use Slicing Maelstrom when i have Flash on,cause in this mode you can surprise the enemy. Note Patch 8.9 P.B.E changes,mini rework at Kennen with Electrical Surge and Lightning Rush Electrical Surge gets on pbe a large buff,he gain more Base Damage and more Attack Damage,which possibly makes him a champion who can try a hybrid build. Lightning Rush If Lightning Rush damages an enemy champion, Kennen gets 30/40/50/60/70% Attack Speed for 4 seconds upon existing Lightning Rush. Lightning Rush bonuses no longer remain when Kennen returns at his normal form. This change will probably make Kennen build a hybrid build combination like : Guinsoo's Rageblade, Nashor's Tooth and Hextech Rocketbelt or Hextech Gunblade

Flash is the first spell for you,great engage spell,that always made me proud :) You can usually start a teamfight with E-FLASH+R+PROTOBELT+W+Q
Ignite second choice for an agressive start,i use that vs Easy countered champs like Yasuo, Akali, Lux
Teleport,use that if you want more map control for your team
Barrier against assasins like Zed, Talon etc

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Pros

+ No mana champ
+ Very good at teamfights
+ One of the most fun champ to play with.
+ Almost impossible to catch when mastered.
+ Fast wins.
+ Great snowball
+ You can easily turn on a teamfight for your team


Cons

- Easy to play. Extremely hard to master to climb in a big division.
- You must stay focused and calmed to play him good If you overextend with Slicing Maelstrom off and with no energy,you are dead
- You'll get flamed sometimes for picking him at mid,cause he is normally a toplaner,but i prefer to use his snowball power in other lanes,and Mid lane is the easiest one
- Squishy champ.
- He have troubles against Guardian Angel and revealing champs like Malzahar or Lissandra

E on creeps, W, auto, Q, auto, keep auto small creeps with normal aa if they're one or two hits saving W passive charged autos for the big creep, W when it's up again.

Simple combo:Q, 4 th hit on minion,w active,w passive
What i mean up with all in?
This combo: W passive auto, E, Flash W active stun, E(cancel ur e) aa + Q + aa
Ranged stun: W passive+Q+W for a ranged stun
Chase combo: E+Q+W
Retreat combo: W passive+Q+W
Maximum damage combo: E+R+PROTOBELT (protobelt after R in MAX 1 sec,biggest impact damage,and you should like it) +W+Q+W passive and there you have 2 stun stacks,the enemy can t even move,also you can use ignite for secure if you re not feeded yet
Melt build combo: Spellbinder+ Lightning Rush+ Slicing Maelstrom+ Hextech Rocketbelt+ Electrical Surge+ Thundering Shuriken

A little note here: As Kennen mid you must get kills using your lvl 2 Doran's Blade harass,or you have to get kill after catching 2 or more Thundering Shuriken and then go all in. The third choice is to roam if you're not feeded yet,cause that's the last option to you to be usefull in a game.

If you defeat your enemy easily you can push his tower for a maximum chance of roaming or just put your minions on his tower when he s dead and go roam instead. Always keep your W passive when you go for roams,that means you don t need everytime your ult and your teammates can help you a lot with other stuns btw

You can see in the video,if you play with teleport on midlane for roam you can keep it smart when a thresh land a w,jarvan 4 land his flag or when zac passive is on,cause you can detroy enemy s attention and get some simple kills

Kennen is a very fun champ tho,i don t have the perfect guide for you...I write a lot without an editor or whatever xD I hope you can climb with Kennen like me.And a secret tip:If you play Kennen as maximum potential,you d never get bored cause he s one of the most funny and great champ in LOL. Good luck in your games,Summoners,with love,ShockMaster