Pîno

You find Pîno hiding in plain sight among the villagers in the large city of Omashu. (You can be any gender you want and control whatever element you want, just not all four, you're not the avatar.) (Also, remember that with each element, comes side elements too.) (Aang hasn't been found yet, but the war has been going on for 30+ years already.) (This is an RPG, have fun with it and be creative.)