Hellboy is a comic book character created by writer-artist Mike Mignola. He has appeared in a number of eponym miniseries and one-shots, as well as some crossover.
A demon whose true name is Anung Un Rama (the Beast of the Apocalypse), Hellboy was brought to Earth as an infant by Nazi occult. 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, to make his appearance more "normal"), and an oversized right hand made of stone. He has been described as smelling of dry-roasted peanut. Although a bit gruff, he shows none of the malevolence thought to be intrinsic to demon, 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.
Hellboy fights for the BPRD, an international non-governmental agency, and himself against dark forces including Nazis and Baba Yaga, in a series of tales that have their roots in folklore, pulp magazine, vintage adventure, and horror fiction. In the stories, he is identified as the "World's Greatest Paranormal Investigator."
The comics were adapted into a 2004 film starring Ron Perlman, a 2008 film sequel, Hellboy II: The Golden Army, and two straight-to-DVD animated films, Hellboy: Sword of Storms and Hellboy: Blood and Iron.
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Official Site: Dark Horse Comics
Links: Hellboy Wikipedia page Hellboy imdb page Hellboy offical page