Multiplicity

We haven't either. We've known several people who faked it, or who faked having something plural-like (past lives or characters who fronted and talked through the body, etc). And yeah, what you said about the stereotypical personalities thing; not necessarily that they did The Good One vs. The Bad One, but they'd have these flat caricatures, like The Wise Mystical One, The Sexy One, The Bitchy One, etc. In several of those cases, I think we knew deep down that they were putting on an act, but we held out (unwisely) because we wanted to believe we'd found others.