Hellboy is a comic book character created by writer-artist Mike Mignola. He has appeared in a number of eponymous miniseries and one-shots, as well as some crossovers.
A demon whose true name is Anung Un Rama (the Beast of the Apocalypse), Hellboy was brought to Earth as an infant by Nazi occultists. He was discovered by the Allied Forces; amongst them, Professor Trevor Bruttenholm, who formed the United States Bureau for Paranormal Research and Defense (BPRD). In time Hellboy grew to be a large, red-skinned demon with a tail, horns (which he files off, leaving behind the signature circular stumps on his forehead, not to make his appearance more "normal" as some have theorized, but to better pass through doors), cloven hooves for feet, and an oversized right hand made of stone. He has been described as smelling of dry-roasted peanuts. Although a bit gruff, he shows none of the malevolence thought to be intrinsic to demons, and works with other strange creatures in the BPRD. This is said to be because of his upbringing under Professor Bruttenholm, who raised him as a normal boy.