Really good junglers right now

Elise, Malphite, Master Yi, Xin Zhao, Leesin, etcs. Many are good but it is tank meta so you might want tanky builds for junglers unless you're fed early on for faster jungle camp clears for damage items.

Yi is perma ban imo. I'd recommend Trundle and Ekko. My personal main champ is Nidalee, who is still really strong given to a player that has high mechanical skill and has mastered the mechanics of the champion. I would also recommend Rek'Sai, who I have a high winrate on despite her overall winrate being low. Just go warrior and Titanic Hydra on her and she's really strong for carrying games.

They pretty much summed it up. I like wukong too. That ult is game changing. Also, Amumu is huge.

Or you can Elise. She has stun/snare *cocoon also burst damage abilities and escape ability. She can gank early on and be effective early/mid/late games. She can go leashless and tanky if you choose to. Her spiderlings are very great if you allow them to agro camps early on.

I recall seeing some videos on pro players and they were asked 'if you had to only play one jungler to get to master, what would it be?' and the answer was always reksai. She can build tanky and be relevant at any stages of the game. Easy to play too.

Some strong champs: Yi - Xin (devourer) Malphite - Amumu (really strong in teamfights, but can be counter jungled early) Lee is always good at any levels of play. So is Elise.

My 2 personnal favorites these times are Gragas and Vi.

Gragas: Build the AP jungle item into tank. Great disengage (or engage tool), kind of slippy, and tanky. You can build him full AP if team need DMG and has another tank.

VI: Since warrior enchantment was untouched but other enchantment were nerfed, she's IMO in the strong side. Except nocturne, best engage from the jungle, can't be dodged at lvl6. High AD scaling, you can also build her somewhat of a tank.

Both are relevant early, mid and late game and can either gank all day or farm all days for late.