Don't worry it wont really make you gay if you play him and love being 20/0/20 in the end of an game. He is just awesome. Easy escapes for ganks, passive helps last hitting, can jump over any wall every 10-12s depending on your cdr. spread the love of gay4j4 guide <3 <3 <3 <3

Don't forget that your passive does bonus damage also to minions if you didnt auto them for 10/8/6 seconds. So don't hit minions before last hitting so this passive keeps working for the last hit. Especially in early game it helps farming if you don't have Hydra. After Hydra you can sh!t all over the minions anyway.

If you play in a ranked team with Jarvan here are some good combos:
Orianna, Malphite, Yasuo, Gnar, Rumble.
They all can use their ultimates at once. Jarvan ult cages them, Orianna can easily hit her shockwave, Malphite can jump in and knock all of them up, with Yasuo he can ult directly after. If only Yasuo but no Malph is there he can still hit his tornando on all champions caged in Cataclysm, Mega Gnar can ult them into jarvans wall so they are stunned. Rumble can hit his ult and do lots of damage while they are in jarvans ult.