I fight with the avatar issue everytime I join an online community :S
I had an anime one once even though I don't watch anime myself. A one of an unarguable gorgeous blonde character, too, even though IRL I'm the opposite of that, except for the blonde part. I love Japanese culture, though, and she looks like what I want to look like, toned down to real life limitations of course.
I don't use my face because I have a legitimate(confirmed by every orthodontist and orthognatic surgeon I've seen) deformity, also I believe what one's face looks like has a lot to do with what people perceive them as, and sociological studies have always backed that up. I have to deal with that IRL, I don't want that to be a factor online. Not even in a forum as welcoming and friendly as this one, I don't want to risk it.