Ganker? Go for Lee Sin or Shaco. Camp the lanes forever or camp the enemy jungler like a douchebag and laugh in their faces. Riven is a great ganker and so is Xin Zhao. Or you could go for Rengar, the buffs made him really strong. His first clear isn't the fastet but it isn't the slowest, strong ganks pre-6, godlike ganks post 6, can counterjungle alot of other junglers by just straight up camping them and slaughtering them.