One specific nerf I would like to see is to have Kai'Sa's Q missiles fizzle and miss if she loses vision of her target.
Definitely not the only nerf she needs, but that would be very nice to add a bit of counterplay against her for when you think you flash away to safety only for the last few missiles to hit you.
I would definitely like if she stopped scaling like a mage when she is meant to be marksman/assassin.
In my opinion kaisa q is a super badly designed ability that should be redone from scratch. In pretty much any matchup in any lane, it's common to walk up to harass the enemy champion when he goes for a last hit. But you just can't do that against kaisa. She'll turn arround aa you, and press q, gets her last hit and outtrades you in that short exchange, cause the other 4-5 missles fly onto you. Of course there are other champions with abilites that can harass and last hit at the same time, but all of them are skillshots that you can juke arround by stepping forward and then not going for the harass. Unless I play caitlyn or maybe jinx with rocket launcher, I don't even try to punish kaisa with aa anymore when she goes for last hits. It's just that dumb to play against. Even if you nerf kaisa's stats, kaisa will never meet the expectations of being similar to vayne, kind of hypercarry. Kaisa will always have an easy and comfortable laning phase that can be played into any matchup, while also being a extremly well scaling lategame-carry
The ONLY nerf she needs is: her teammates should no longer apply Plasma stacks. If you don't play Kai'sa and don't understand what this means, its like is Yasuo would only be able to ult if he hits someone with his own 3rd Q and his teammates couldn't help.
Kaisa's damage is spread in 3 places: Passive, Q, W on a target with more than 2 plasma stacks.
Which is why many Kaisa build involve on-hit items such as: 
.
So, if her teamamtes would stop applying her passive with their CC she would:
All in 1 simple change
Here's some ideas of changes I'd make to Kai'Sa.
Idea 1: Lowering her obnoxious poke and waveclear.
Void Seeker (W) Range lowered from 3000 to 2500
Icathian Rain (Q)
Damage modifier to low health minions: 200% => 150%
This would hurt her bullshit poke and would significantly lower her waveclear in lane.
Idea 2: Making her evolves come a little bit later
Icathian Rain (Q) - AD required to evolve ability: 100 => 120
Void Seeker (W) - AP required to evolve ability: 100% => 120
Supercharge (E) - AS required to evolve ability: 100% => 120%
Nope.
https://u.gg/lol/champions/kaisa/build
47.9% Win rate.
And she is not a technical champ to learn. In other words, she's floundering even though she's a fairly simple champ to learn.
Here's what REALLY happens:
nerf second skin damage and Q damage and nerf W AND R range
She actually just needs to flat out reduce her burst damage from her Q, it's just too much from a targeted ability.
I would raise the amount of AD AP AS she needs to unlock the bonuses from her abilities. Make it so:
1.- She doesn't become such a monster so early, cause she isn't even bad early game to begin with. 2.- You can't have all 3 at once. You should have to make a choice between AD or AP heavy Kaisa.
Would be nice if she actually had to auto attack to do dmg she literally doesn’t auto as a mark men’s to delete you. So lower her ability ratios period and force her to auto attack to do damage.
Then look at some way to enforce some skill of play onto her aka the if your in range I just mash q and it all homiming middle hit make her atleast directionally aim q
Reminder that Caitlyn is still obnoxious
She got picked several times at Worlds. I am more worried about Ryze though. He needs a new rework or a nerf, then Kai'Sa, and about Kai'Sa, i am not entirely sure.
She made the best outcome in a 2v1 scenario once at worlds, but she was fed, and the opponent took tower shots.
And her Q also stopping once she dies, not her pressing it and after she dies you die with her without anything you can do
