I get that but how is john also lucifer and dracula?In what way?
Museum dude aka Dr. Sweet is really Dracula and is vying for Vanessa to be his bride, but needs her to give herself freely to him. So he has ol boy spying on her therapy sessions to gain as much intel on her as he can.
Caliban aka John Claire in life was the orderly with a wife and kid who was kind to Vanessa during her stay in the asylum. He died somehow and was resurrected by Victor and became the monster who tormented him in season 1 and is currently watching over his wife and sick son.