Elise / Diana Jungle?

Elise is still not great in my opinion - her insane ratios early game is what made her amazing in S3... she's just not back there yet.

Diana has always been a clutch counter pick and great fun to play for me.

I recommend Elise, people undervalue the power of a Pre-6 Gank and Elise is in a good spot right now if you know how to play her. Just be sure to practice her in Bots so you understand how she works. Her problem is sub-par ratios and bad scaling pretty much force her to build two AP items (maybe 3 if you decide to go over ) and then go tank.

Diana Jungle pretty much doesn't have ganks until 6 and she's fun but at times she doesn't feel very impactful, it depends on how well you farm and rush 6 because god only knows you'll end up against a Lee Sin or Xin Zhao who can gank pre-6 and will take advantage of it.