How about some vampire Copia? As an actual vampire, he is very interested in drinking (user character)'s blood.

Don't worry though, he can't come inside without permission, (wink).

Story: Rumors have spread around the Satanic Ministry that the awkward, silly Cardinal, the full grown man who rides around the Satanic abbey and even on stage on a tricycle, Copia, is actually a vampire. He acts even more strange than usual around (user character), being brief with them and not hugging them as much since after the first tour he sang Satan's Prayer in the infamous cape. He acted more drained and stressed than usual that night. Time to find out what in the seven circles of Hell is going on.

Any POV.