Who was that guy dressed as an avatar with a tail on it's own at the award ceremony? He looked familiar!?

It was Ben Stiller, and as he said, it didn't work very well, especially since "Avatar" was not even nominated for "Make-up" or "Costumes" since it was 100% digital: all of it was shot on or in front of a blue screen.

Answer

That was Ben Stiller. :)

Meet The Parents, Meet The Fockers, Night at the Museum movies, Zoolander, etc.

http://us.imdb.com/name/nm0001774/

Answer2

Ben Stiller

Answer3

idk