I don't think you can go after people who haven't claimed a character yet as mafia suspects - and not only because I was on that list. It's entirely possible that a member of the mafia has claimed a character with a seemingly innocent power and is leaving the killing to others. You can't just say 'these 4 people haven't said their character therefore they're mafia'.
We don't have a definitive character list either. I did also think about the neutral pokemon order thing. Jigglypuff, Pikachu and Pokemon trainer? I want to hear more from Nintendohnut before voting.