That's nothing, I made a Rock Lee Mii and it looks exactly like him. Sure it's not an 'Avatar' (though I hate using that term considering I play FFXI and those are summoned creatures' names), but I think someone could make him on NXE. I also made InuYasha, Kagome, Shippo, Sango, Miroku...etc.
Someone should make Cartman, but then again, the person would have to be tall. Meh, there's always a wait for Wii HD for me.
Sorry if I got off-topic there...lol