I have a name for Aang now. Captain Planet! You know, because of the Earth/Fire/Air/Water/Heart, thing.

Avatar Aang
He's our hero
Gonna take the 100 Years War down to zero!
He's a bender magnified
And I'm really bad at parodies!

...Anyway, Aang is Captain Planet now. And if they ever need an anti-Avatar, all the bad guys need to do is find a radioactivitybender, a deforestationbender, a hatebender... No, I don't know how that would work.