Summoners Rift:
you know that khazix is a jungler, so you can farm in the jungle.
get at first blue buff, ask the one whose mid to help you.
then you do ghousts, then wolfs, then golems, and then red buff :)

Twisted Treeline:
Just Farm EVERYWHERE!

make damage at first with Q to get first kills.
use E when enemy wants to flee.
Use R to make ultimate power.
R: - 1 claws / skin
- 2 wings
- 3 Spikes

Pros:
-Kha'zix is Strong
-Kha'zix has got evil attacks
-he have got speed
-can be invisible :D
-can jump away with low life when he has got
-Jump hasnt got cooldown when you kill someone :D (champion)
-hes voice is so scary :D

cons:
-needs mana
-cant go mid really good
-everybody hates him
-hasnt got much armor

Rengar and Kha'zix are enemys.
but when they work as team, they are strong :D so use it with a friend ;)

Kha'zix isn't the one who likes teamfights. he likes kills. he is the best to ks all the time ;)

you can troll enemys like this:

With your ultimate attack, you can troll so easy xD
so use it :)

please, kha'zix ganks so cool..so use it and dont be afraid of something :)

because hes quick, strong, evil and his style is so awesome!
he is licking his claws when he kills somebody :)
and jumping around and he is so awesome :)