Im thinking of an avatar game. It would have progressive powers (Bending) as you go on.
Say you start as a fire bender. You progress from a weak fire blast then you get stronger and stronger. Then there would get scrolls teaching you Lighting bending. An avatar would be someone who beats all the story's.
This would take place before the war so there would be more Air Nomands. It would be an online RPG You would go from Level 1 to 100. If you were someone who couldn't bend (Non-Bender) you could use any weapon. Swords, Boomarang, and Bow and Arrow. Bender's (To make it fair) would be unable to use Melee weapons. You could also get a rank such as. Warrior, Captain, Commander, and General. It would take a while to level up because there a few ranks. There also would be clans. You could name it stuff. You would spend bronze and other coins.I hope you like my idea!