Twitch is a great jungler after you get your red and blue buff head mid with Ambush the and pick up a easy first blood

Now I won't go into full details for all these guides yet i'm going to do a lot of testing.

Now you don't have to take exhaust you can also take Flash instead of Exhaust or Barrier

Pros
+ Great at all stages of the game.
+ Easy to position in fights because of Ambush.
+ Good late-game scaling.
+ Amazing single target as well as AoE damage with Spray and Pray.

Cons
- Close to useless in team fights without Spray and Pray.
- Hard to harass enemies under turret because of Deadly Venom.
- No traditional escape mechanism, relying on Ambush.
- Smells like dog ****.

(TOO BE CONTINUED-> Just like what it says when you step on the weight scale)

Urgot is of course one of my favorite junglers of all time

again details will come in later i'll just start with pro's cons
Pros

- Fast cleartime late game
- Awesome at 1v1s Zaun-Touched Bolt Augmenter
- High dps when building tanky
- Can carry games when have trash people just saying

Cons

-YOU NEED BLUE Q SPAM OP
-Early clear kinda slow
-that hoe counter ganks you smack him with them crabby legs

Kassadin seems like it wouldn't work but it's kind of a fiddlestick play style

Pros

Kass is self explanatory op as always

Cons

riot will nerf soon enough
just like Fiddlesticks most usefull lv.6