So, the point of all this is to ask for enough information that we can start narrowing down scum, while being oblique enough to protect ourselves. It also can't be too damning a question, because otherwise the scum will simply lie.

That said, someone with more familiarity with Phantom is going to need to check us, because, for example, I have no idea if "Is your character an opera singer" is so broad as to be useless, or if there are only one or two singer characters.

That said, some possible questions:

Is your character an opera singer (that is, do they sing in-universe, not "do they have a song in the show"?

Is your character male?

Is your character older than 40?

Is your character murdered? (No idea how many deaths PotO has)

Does your character attend the masquerade?