Sources: About.com   &   Wikipedia

DEVILS NON-DEVILS
666 Ambrose Bierse
Antichrist Confucius
Beelzebub Cthulhu
Der Leibhaftige Erik the Red
El Diablo Galbatorix
Iblis Gorgon
Leviathan Lord Voldemort
Lucifer Napoleon Bonaparte
Mephistopheles Palkia
Old Scratch Polymorph
Satan Stjórnarskrá
  Temujin
  The Red Baron
  Uruk-Hai
  Xanadu