The short answer is Yes, the theme is indeed flexible. After all, the design of game has always been driven by mechanics, with the theme serving to make the mechanics as easy to understand as possible. Naturally, some themes are better than others, and the Demons theme has worked pretty well so far. Yet…

Social deduction games tend to be about information. Most players have the goal of accumulating information about the roles of the other players or preventing information about their own role from being revealed. This structure dates back to Mafia, considered by some to be the original social deduction game…

Hidden roles are a common feature of social deduction games. Each player typically has a secret role assigned at the start of the game, with different roles having different powers or properties. Yet, if hidden roles are designed recklessly, they can completely break the game. This is the "massclaim trap"…