I'm Aazure (isn't that a color!??!) and I main Rengar for jungle. Rengar is a high mobility assassin that is made for jump scares and making people sh*t their pants while you f*ck them up. Rengar was originally made as an AD assassin, but Riot didn't expect people to build him AP. Many people think AP Rengar is a waste of time and energy but I think it's a very viable option.

PROS:
-You delete squishies
-Your main damage can heal with ferocity
-If fed, late game damage is INSANE

CONS:
-Tanks can survive the heavy burst
-Low damage early game
-Horrible late game unless fed
-Can be outdueled before you get Ludens

Start Q (like normal) and do krugs. (Weird **** happens here) You then go to WOLVES and kill them. Then you go back to red, by then your smite is back up and you will not get killed by red. After red, depending on how good your leash was, you can go raptors or back. Either way, first back get Trailblazer and your sustain will be much higher. Now because of Runeglaive, try and get a NLD second back or at least an Aether Wisp for Luden's Echo. From then on, you can go wherever you see fit.

Right before you gank, make sure you have 5 Ferocity. Now, depending if you're level 6 or not, you'll either E to snare them or ult, jump, and W twice.