As for Labelle, if you planned on doing it where she literally chooses her alignment everyday, then there's a few questions that get raised there:
1) How is this going to affect KP? Generally in mafia on here, the amount of kills mafia can use per night is current mafia/2, rounded up. So say there's 2 mafia left and Labelle decides to join the Gracies that day. Would mafia have 2 kills or one kill? The only workaround I can think of is giving mafia a fixed KP (probably 1) the entire game, but that would definitely have to be accounted for in balancing the game.
2) Wouldn't Labelle just side with town until mafia is close to majority and then side with them? Seems like its a really easy mechanic for Labelle to game.
3) Due to the possibility that Labelle could be mafian, I could see people autolynching her even if she is town that day.
If you make her a Survivor though, then she's her own party, actually! She can win with anyone, she just has to be alive at the end.