Big Black Nemesis, Parthenogenesis
Nemesis the Warlock: Arch-deviant, Lord of the Flies, sworn enemy of the Universe's greatest fascist, Torquemada, and the subject of an eponymous song by Shriekback (that dealt brilliantly with the slippery nature of evil). Nemesis is definitely one of 2000AD's more memorable creations, and my favorite comic-book character.
An interesting overview that shows how the style of Nemesis and Torquemada evolved, as well as a fantastic gallery of 2000AD art is on display at ABC Warriors.
