Practically anything that isn't a mage or caster.
Fizz. If he tries to Q harass, QW in, make him pay.
Caitlin, proceed to headshot Kass all day long.
Kassadin main, reporting in.
This image is oddly relevant in quite a few places.
Dies to Wolves
Anyone with burst. You already know what Kass is going to do...just get a bit of MR, survive his burst/silence combo, then counter with your own burst.
If he's like most Kass' he's not going to bother getting defense...easy kills.
I usually play Malz, so it's easy for me to kill him.
I have good results against Kass with Swain but Kass' late game is just as good as vayne's imo
Doesn't matter because his jungler will babysit him until 6, at which point he goes nuts.
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