is one of my go to junglers when I need to put my carry pants on. He isn't all that hard to play well mechanically, he's more about game knowledge and knowing when to fight, how to engage and disengage, how to take advantage of your Isolation, etc.
is only 450, and I'm sure you own him. He dominates against uncoordinated play. Similar to Kha, he's not that hard to play mechanically (honestly you can get fed just running at people and right clicking them if the enemies are idiots) but he does have a fairly high skill ceiling. Learning how to juggle tower aggro and dodge abilities with Q and using Meditate properly is what separates a good Yi player from a great one.
has seen a fair share of nerfs recently, but he is still very strong in the right hands. You can play him top, mid, or jungle, and go full AP, full tank, or somewhere in between. He has meaningful damage at all stages of the game even when tank, has great mobility, strong (if difficult to land) crowd control, and an ult that is one of the most powerful disengage/re-engage tools in the game. He is, in my opinion, a lot harder to play though.
is one of my favorite top champs. She is one of the best "anti-carries" in the game as well as a strong duelist. Even with just a
she can assassinate carries with ease. Her early game is extremely strong against people who don't respect her damage, and once you get a Sheen your damage will skyrocket.
is getting thrown in here because personally I love the champion. He has one of the strongest level 2's in the game with a Dark Flight/Blood Price engage. Great in lane sustain, strong poke with E, a revive passive, and an ult that, while seemingly unspectacular, adds a lot of power to his kit because of his reliance on sticking to people and auto attacking them. In the right hands (and if you take the time to learn his strengths and weaknesses) he can become an extremely potent hypercarry that can become impossible to shut down. He is extremely reliant on snowballing though, so you may want to start with someone else I mentioned above and save him for later.
I'm throwing this in here as a bonus, as vision, especially on a jungler, is very strong right now. I personally always get this on Kha'Zix, as I find my playstyle with him revolves around ganking->stealing enemy jungle after successful gank->repeat. Putting wards down during this time can save your other lanes and help you get surprise kills in the enemy jungle. Obviously pick whichever smite you want, but I'd recommend at least trying to go without a combat smite and seeing how you like it.
Anyway, I obviously only listed a few champions here, and my opinions are my own, etc. If I had to pick 2 champions out of this lineup, one for top and one for jungle, I would go with Irelia and Kha. They've just got everything you want and need to be able to carry with them.