One game mechanic that I have really liked I think we should use is the Mambos who uses her voodoo set the fate of one player onto another.
So basically what happens is everything that is going to happen to one player, ends up happening to another. Examples:
The Cultists target player A to sacrifice.
The Mambos sends player A's effects to Player B.
Player B gets sacrificed instead.
OR
The Cultists target player A to sacrifice.
The Angel saves player B.
Mambos sends player B's effects to A.
Player A gets saved from the sacrifice.
Yes, this means that a Cultist could end up killing one of their own.
The trading effect switches everything, so a different person may be investigated instead and such. If the player wasn't targetted by anything, then obviously nothing would happen to the other player.