And I had to think about my old theory that Beetlegeuse somehow is an older Subaru from the future, like a corrupted version that succumbed to his lust for Emilia. A couple episodes ago Roswaal talked to Subaru about 'becoming/being" like him, Roswaal, and since both Beetlegeuse and Roswaal are clown-like eccentrics, well ...

I know, probably totally wrong, but oh well.