Aang
It depends on which avatar you're thinking about. The Na'vi are not real and niether are the "human" na'vi that people can go into. But avatars such as characters on a computer game are real.
her name is Yangchen and we dont get told the avatars before Yangchen
probably Quagmire
Asia.
ask a moderator or a helper
IMVU, There, AIM, and Meez. Dream Avatars or tektek Ourworld, Habbo.com My Animal Family at MAFkidsclub.com is safe for younger kids.
No, there is a list of avatars you have to use.
fantage! it has avatars and chat.
HAbbo and There have avatars and horseland and howrse. you can chat by writing stuff in the box iddin has avatars
No there are no avatars for message boards yet
go to jellyneo.net and they have cheats for getting avatars.
Gaia Online has some pretty good manga avatars