The Two-Facer

Bonus Points if they actually have two faces.

The one who puts on a facade to trick others into believing they're a protagonist (a role like the Support or Helpist) when they're really an antagonist. The Two-Facer usually hides their true intentions until it's time for the truth to come out. It's common for the Two-Facer let the audience and no others in on their secret with a Lone Evil Laugh or Menacing Grin to show that, no, they aren't a good guy. What isn't common is somebody else lurking and watching quietly as they do this, now becoming aware of the Two-Facer's true identity. They become the Secret Bearer and must report this to the Good Guys without getting caught by the Two-Facer and forced to keep their mouth shut about what they've learned.

Many roles can double as Two-Facers. One such role is the Twist Villain, a kind of Villain who fakes a good relationship with the Good Guys mainly for their own reasons from the moment they're introduced to the story. When it's time for them to cut the act (often around the climax), the Twist Villain could explain what their plan was and Break Reality to the Good Guys, saying that they aren't really friends with the protagonists and were only using them to get their way.

A Two-Facer has potential to flip the entire story on its head with their Real Role Reveal. If played just right, they could destroy the relationships the Good Guys have and, if they're on a team, rip the group's fabric apart. Enter the Low Point and a possible Unhappy Ending. If played wrong, however, the Two-Facer could set themselves up for an auto-foil that quickly comes back to bite them and make achieving their scheme a Ded Dream. This Real Role Reveal play can reach its full potential if the Two-Facer was pretending to have a very good and close relationship with the Good Guys, putting in the effort to be on their team and work with them towards their own purpose and only setting their scheme aside for a little while until the perfect opportunity to twist the story arrives.