I'd be more likely to think people's avatars are an extension of who people wish they were, if it had anything to do with their personalities. I know it's true for me - I've always been the overly responsible one in the family and at work. So I envy the "flapper" personality - one that can just go out there and grab fun as it comes!
If I had to pick one that was more like me, it'd have to be: