I don't think I'm going to have time to join this game. (Plus, Luigi is already taken!)
About mafia role-playing: I've only played once, but it seems that if there aren't many role-playing posters in the game, attempting to role play gets you killed. I guess it makes you stick out too much, and especially when there's a secret bomber in the game, it's easy for others to get suspicious of you.
Good luck, everyone!