@Serverclosed
Not sure if he is a reference to something specific, but he's one of the strangers. He wants to explore the mansion, knowing there's something wrong with it, he appeared once or twice before.
@Serverclosed: I always think of him as a Stalker, someone exploring in hopes of getting valuable supernatural artifacts. (Like the games S.T.A.L.K.E.R.: Shadow of Chernobyl etc)
All these different wanderers going through the elevators really puts into perspective how big this place really is. I wonder if we'll see more new people.
Also I just noticed that the Otters don't wear shoes unlike everyone else.
I just realised that the time in the elevator and the time outside of it isn't linear compared to the rest of the building, at least when there's only the elevator girl inside of it / no one is in it.