Also Master Pandemonium.
He was an actor who was in a car accident and was dying. Then, the Devil (well, Mephisto) appeared and said he would save his life for a price. The guy accepted, and Mephisto said that he'd ripped out his soul and scattered it about the Earth. If he could find all five pieces he would be free; it would be a quest for Mephisto's amusement. He discovered he had a hole in his abdomen in the shape of a pentagram, but on the upside, he now had the ability to manifest and expel an apparently endless number of demons from his body. Hence his name: Pandemonium, ie. "Home of all demons".
Turns out it was a scam; it was in fact not his own soul he was looking for, but Mephisto's.
Oh, and perhaps also The Darkness, aka Jackie Estecado; so long as he is in the dark, he can manifest a host of little devils to do his bidding. Apparently they are his own 'demons' of the mind given form.