pretty much what you want to do is look at what your teammates picked, if your top laner is more of a tanky champion then you can go offensive like olaf and riven, and if your top laner is offensive then you should be a tanky jungler like skarner amumu and maokai, at least thats what i do
also looking at who their jungler is too like if they have a shyvana you should pick someone that doesnt get hurt as bad from counterjungling and if they pick someone like amumu that can get killed by counterjungling pick a counter jungler
also looking at who their jungler is too like if they have a shyvana you should pick someone that doesnt get hurt as bad from counterjungling and if they pick someone like amumu that can get killed by counterjungling pick a counter jungler

Thanks to TheNamelessBard for the signature
You need to log in before commenting.
Amumu, Olaf, Cho'Gath, Skarner, Udyr, Maokai, Riven.
I also have Dr. Mundo and Nunu, who I haven't learned. I'm thinking of buying Zed as well.
Question, though: Generally, how do you decide which junglers to use? Which junglers (or types of junglers) work best in certain situations?