Paracelsus

An enchanter whose true body is a skeleton (He can transform into the form a young man) he is a physician and a pervert. He constantly gives Haruhiko advise and help. He seems to like Eukanaria and usually tries to touch her resulting in a hit. He also tries to help Haruhiko with Yuka and even suggests that he hurry up and sleep with her as a way to prevent her from being targeted by demons. He's actually a strong fighter and not even Fulcanelli was able to beat him. He has an assistant named Ai. (wiki)