I'll play almost any class (except barbarians) if I'm in the mood to do so. I also like to fancy myself as a good role-player, but I'm around so few that my standard might not be a good comparison. Past that, I'm fairly laid-back, and don't mind goofing off in a campign. It's a game, and it's supposed to be fun, and if the general concensus is that we're as serious group, I'll play seriously, if it's informal, I'll be informal.