“Pre-6 he's not an issue. If he ever jumps into you he dies. Be careful of face-checking Kha'zix when playing against him and use your E to deny his burst damage with electrocute. After level 6 he becomes a lot harder to play against, just because of his raw damage. If you haven't snowballed till now you want to avoid him at all costs. Oracle Lense can help you to hit your ultimate or chase him; use your ultimate when he's in the middle of an animation so he can't dodge it with his jump.”
“Kha'Zix is only a bad match up if you feed into him. Do not fight him if you have less health than him early in the jungle. If you both scale accordingly, you won't have any troubles in teamfights. ”
“This champ is currently overpowered so now he wins this matchup. He has the sticking power to kill you and his Q is really low cooldown so your shield won't save you 1v1. Try to fight near allied minions, champions or towers to avoid isolation. Don't ult him unless his Leap is on cooldown.”
“Do not fight him in the jungle unless you got a lead. Better dont invade him unless youre very ahead”
“Even with phase rush, you can't run away. Aftershock may be necessary into Kha'Zix. Too much damage. ”
“Pre lvl 6 you can beat him. After that or if he gets fed you should avoid him. Try to W his Q when forced to fight and stick to your teammates.”
“Kha'Zix is hard matchup you can kite him with red buff if you don't waste your q stupidly. After he hits 6 you are basically doomed. Worthy of a Ban.”
“Kha’zix is slightly stronger then Kayn as he will be able to win pretty much any 1v1 with his Isolation passive. The matchup is definitely somewhat even, especially in the context of fighting non 1v1, but can have its ups and downs overall. Early game, you can contest scuttle crab as long as you have lane priority and can force a 2v1 or 2v2. Also, you can clear much faster than Kha’zix so don’t be afraid to powerfarm especially in the early game. As Shadow Assassin, as tempting as it might be to one shot him, be very careful dueling Kha’zix as he will win the fight if you don’t play it perfectly or if he is ahead of you. ”
“This is skill match up. Be careful before your level 6. Also if he build MR it will be big problem for you. ”
“I put even threat for K6 simply because of how squishy this guy is - even though it really is whoever gets the jump on who that will win this matchup.
Nidalee gets the upperhand since she can trap bushes/track enemy junglers using a relatively low CD area ward (bushwack)
Trap between his camps and ping him out for your team.
This bug will always be looking to flank during teamfights so be sure to trap the routes you don't have good vision on and he should become a minimal threat.
also - Land a spear post 6 and he melts if you have the needed magic pen.”