I wouldn't mind a forum character, but I'm not sure if I've earned one yet and I'm also not sure if I'm weird looking enough/versatile looking to merit it. Maybe with my Lemmy-ish mustache it would be cool.
What I have always wanted is an Elmo-ish character. A postman might be nice as well. A boxer or more sports figures might be cool as well.
mmyers would make a good forumuser character. I think the best ones have multiple uses, and aren't too generic. You could at least use his to represent one of the members of U2.