So far my hardest matchups with her have been Diana and Akali (all akali needs is a small lead to make it completely in her favor [ i hate akali pers.] and I've noticed playing yasuo aggessively against her works well because of her need for set up. I've been playing ALOT of kat so this info would be very helpful.
Rock MD1 votesYou want champions Kat picks well into or pick well into a Kat?
Because if you want good champions against Kat it's simply tanky and/or copious amounts of easy-to-land disruptive CC. Cho'Gath is really funny vs. her.
AMADEUSdotEXE1 votes[{quoted}](name=Chairman Rock,realm=NA,application-id=3ErqAdtq,discussion-id=EGWjwYdk,comment-id=0000,timestamp=2016-11-27T19:23:19.479+0000)
You want champions Kat picks well into or pick well into a Kat?
Because if you want good champions against Kat it's simply tanky and/or copious amounts of easy-to-land disruptive CC. Cho'Gath is really funny vs. her.
Its more or less what not to pick her into and who to pick into her if im going mid. Yas is good into her if you play aggro but cho seems like he's be able to ruin her day no matter where he goes.
Astôlfo1 votesWha- Kat completely shits on Akali.
AMADEUSdotEXE1 votesWha- Kat completely shits on Akali.
I know, but i usually get fucked by Akalis jungler or she roams and gets fed (despite mias) so i just kind of throw her in becuase of her all in potential
Banana Nations1 votesAlright i gotchu
Really strong picks into katarina include: 
i know its throwing a lot out there but these are pretty much unbeatable if you can play them to a good extent verse katarina