Master Yi

He's extremely strong because of his E which gives him true damage out of the gate and also get's bonus AD per level ability which melts you immediately even with full armor items. He's must ban champ in ranked.

Sejuani

She was nerfed recently but that doesn't stop from CC chaining you with all 3 abilities, even more so once she hit's level 6. Thankfully she isn't often played, so don't worry much about her being threat.

Rek'Sai

Her base AD and base damage on her Q is enough lower you so you can be executed when she invades you. She's quite strong in early and mid game, but afterwards her scale hit's the wall in 30 min.

Nunu & Willump

Since you as Shyvana lacks CC, Nunu can counter you very easily with his W and E CC, then proceed to heal from you with his Q, also base damage on his abilities is really strong. Also he has more HP than you which means it really takes a long time to kill him while in that time he can just easily escape.

Olaf

Long as you can beat him by invading him on his either Red or Blue where he is, but you have to set your eyes on minimap when he ganks because he can easily get kills with just Q and E. Try to out scale him much as humanly possible because otherwise it requires 3 people to kill him at all.

Sylas

Don't try to pick a fight on him unless you have a level advantage to help you out, but otherwise he can just steal your R and spam E on you. Alternatively wait for team mate to help you out.

Evelynn

Avoid her charm and let it decay if you caught her charm timer, also don't fight her on low HP because of her R, unless you have Wit's end to help you out which in case just burn her to the ground.

Hecarim

He can be just straight up annoying when he runs with his E on you and escape with it since the cooldown on it is shorter than Shyvana's E in early game

Nocturne

The trouble starts as soon as he has the E and Passive in early game, but long as you have help to kill him in early game, then he wouldn't pose that much threat in later parts of the game.

Amumu

not hard to kill but it takes a while because of his E which reduces the physical damage(i.e. your AA) and combining the armor and magic resist he has

Volibear

Recently he has been starting to appear in jungle, so be careful of his Q since he can easily just yeet you behind him and spam his E, also keep in mind his Passive cooldown. Only big threat he poses is his W which can be hard to deal with in early game but late game he's pretty much useless besides when he pops his R.

Diana

She can be troublesome once she get's 1 or 2 kills before you, but once you beat her in duel every time, then she's just pretty much useless

Lee Sin

Long as you dodge his Q, you're going to be fine but watch out for his R, because he can then easily Q on you and lower your HP.

Ekko

His W can be troublesome if you're ambushed by that, but otherwise just keep dodging his Q, so he can't E on you. Also keep him in one place so he can't use his R to yeet away.

Jax

He can snowball you with his E and W, but once you avoid his E, then you can fight him easily.

Elise

Long as you avoid her E and wait till she's gone from her E in spider form, then she's got nothing going for her since her abilities don't deal much damage on you except her Q in spider form and her spiderlings.

Camille

Kha'Zix

Don't be isolated in early game and get Ninja tabis to survive it, that's it.

Rengar

Could be threat if he's fed, but then again in early game he's easy to kill.

Jarvan IV

Even though he isn't much of a threat, he can easily burst you, but once he popped off, then basically he's dead on the spot

Xin Zhao

Nothing to say much except to be aware of his Q and R cooldowns.

Udyr

Watch out a bit for his E stun, but once you avoid that he's pretty much dead

Warwick

Just look out on his E and you're good to kill him

Cho'Gath

It takes longer to kill him when he has R 6 stacks or more(and more HP) from jungling

Ivern

Even though he isn't much of a threat, he can be a bit annoying to play against him