The Radio Demon, is a sinner demon and one of the many powerful Overlords of Hell. He is the wickedly charismatic demon who has offered to assist Charlie Morningstar in her endeavors, albeit, for his own amusement.chaotic residents of hell for his well maintained amiable persona. He gives a first-impression of a good-natured and charming man, wearing a permanently wide grin on his face at all times. His behavior, mannerisms, and even his voice are similar to an old-fashioned radio announcer