The Caretaker is never really seen except by the teachers. It is said he may be a ghost or even a monster of some kind, who wouldn't want an imortal vampire taking care of thier school? The one thing that is know however is that at the back of the dungeons in a small room he lives and keeps anything of a harmless nature that has been confiscated by the teachers. If you're looking to get something back I'd be careful, he's very quiet...