Junglers that are the most fun in your opinion?
I mained jungle for a time. That's how I got mr 7 lee. Since I'm a jungle main I can point out some of the common mistakes junglers make like for example you see a jungler take chickens, and instead of ganking mid with the enemy already overextended they decide to go for the next camp or top lane. The point is I feel like if I don't play jungle this always happens.
So far my favorite junglers are 
and 
feels like you are playing an olympic athlete landing those javelins and crouching and jumping over walls.
hide and seek game entering enemy jungle.