Ma Chao isn't vanilla, though. And neither is Huang Gui, I suspect. Otherwise he wouldn't have hidden his role when asked this late in the game.

Quote Originally Posted by [M] Ma Chao View Post
Okay, so let's go with the idea that Guan is naive then. Besides our confirmed Emperor, Cao Cao, anyone he investigated may be the godfather. So everyone besides Cao Cao and Guan could be our remaining mafia member.
What makes you think there's only one? A game this size typically has a 4 man mafia. Unless you already know, of course.