For a champion based on Evolving and adapting, Kha'Zix sure does lack diversity

Kha'Zix is supposed to be versatile. You should have to put thought into evolutions. Right now, it's pretty much "am I ganking with E or dueling with Q?" and then getting the other at 11, then at 16 it doesn't matter because cone slow on assassin is kinda useless unless you're Talon, and R is basically a Kha'Zix chroma.

I, and I think many would agree, want Kha'Zix's evolutions to actually be tactically based. Right now his Q and E are like that. Do I want damage, or do I want to dive, or get more mobile? But why would I ever take W or R over the others. W is pretty bleh and R is only useful when fighting idiots who don't buy anything to counter stealth. So why not make Kha'Zix actually need to make choices, thus increases his skill cap, and skill floor, but also making him more enjoyable and complicated.

• Q and E obviously stay. Maybe make Q no longer break iso from towers, after all, it's Riot who said "You're there to protect towers, not the other way around" So it's only logical that the tower isn't protecting you.
• W could also give vision like it does now, but also give Kha'Zix a damage buff towards them, similar to Talon E, basically symbolizing that he's marked you for death. However to avoid it being absurd we might have to make it no long 3 shots, but I really like the idea of his W being used as a mark for prey, because functionally, if I hit someone with my W while ganking, it generally spells death. Also perhaps let him use his W and R in the air? (put that on the E evo of course)
• Now R might seem weak compared to that beefy W, so what makes it a contender for the 3rd slot? Isolation canceling. Upon exiting his R, Kha'Zix could receive full damage with his Q, regardless of isolation. Also, let him use stuff in stealth. He can't use Youmuu's, pots, Hydra, E, etc. without breaking stealth. Kinda BS that all other stealth champions can use actives and not break stealth.

Now Kha'Zix has to think about what he evolves and when. Is the enemy clustering? I might need R. Do I need a little extra steroid so I can kill some harder to kill targets? Take W. The W and R changes allow for you to choose how you'll play the game. If you split push and plan to 1v1, W might be more suitable. But if you plan on team fighting, you could take R for the guaranteed full Q damage.

Also, Riot, you should totally make the next ultimate skin for Kha'Zix. After all he does have all sorts of cool effects you can add on to, think of all the cool stuff your design team can do making a Kha'Zix ulti skin. You've talked about it in the past how he has too many effects so it's hard to makes skins for him, well, he's perfect for that, then! Ultimate skins need to have more bells and whistles, and K6 already has those, and besides, the way you've done them, both his skins are pretty top notch. Imho Mecha Kha is the best skin in the game, it's a shame it didn't have animations so it couldn't be legendary.