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, then becoming aware of the Two-Facer's true identity. This person then 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. However, there are times when the Good Guys are stubborn to believe the Secret Bearer, which creates tension in the story.

Some roles 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. The Shock Villain is a similar role built for familiar franchises. They're often detached from the Main Cast, and if they do have connections such as familiar or friendly, these connections are typically introduced as soon as the character is. Like Twist Villains, Shock Villains hide the truth from the people they mean to deceive until their tricks are no longer necessary. Since they're given less time to make an impact on the audience, the Truth Coming Out doesn't have as much power behind it.

A Two-Facer has potential to flip the entire story on its head with their 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 bond to pieces. This then initiates the Low Point which sets the stage for 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.

UnRec
Two-Facers are powerful roles and great drama fuel. They teach the audience an important lesson: you can't trust everyone in fiction to be consistent. The potency of the role can be capitalized on by writing the character to be like anyone else. They blend into the Secondaries and are impossible to separate from the others, and ideally, they remain this way until it's appropriate for their true colors to come forth. But Truth Comes Out can't be played without a prerequisite UnTrash like Nothing But Sus being involved or else the reveal will feel sudden and unplanned. Initially pinning the suspicion on a primary or a close secondary sets the groundwork for the Two-Facer to be brought into the story, and this can be reinforced with the true Two-Facer joining their so-called friends in detective work on the Suspect. Keep in mind that the Two-Facer must be totally natural during this time and provides no giveaways to their hidden intents. They even look innocent when they're alone with the audience to make their trickery even more invisible. This mean no Lone Evil Laugh, no monologues, and no alluding to their secrets. Finally, when the Two-Facer is sniffed out by a protagonist or screws up in hiding their schemes, it'd be wise to not Pause The Universe to give them the time to blab about How They Did It. The audience can be left to speculate how the plan was carried out using the little hints you sprinkled into the story so it will be discussed for longer after its release. This can build your Two-Facer into a very solid and unpredictable antagonist who keeps the story interesting, even during a Down Point.