Baba Yaga, Lilith, Mafioso, Young Turk, afreet, barghest, beast, beldam, berserk, berserker, bomber, bruiser, brute, cacodemon, daeva, demon, devil, dragon, dybbuk, evil genius, evil spirit, fiend, fiend from hell, fire-eater, firebrand, fury, genie, genius, ghoul, goon, gorilla, gun, gunsel, gyre, hardnose, hatchet man, hell-raiser, hellcat, hellhound, holy terror, hood, hoodlum, hooligan, hothead, hotspur, incendiary, incubus, jinni, jinniyeh, killer, lamia, mad dog, madcap, monster, mug, mugger, muscle man, plug-ugly, rakshasa, rapist, revolutionary, rodman, roughneck, satan, savage, she-wolf, shedu, spitfire, strong-arm man, succubus, termagant, terror, terrorist, the undead, tiger, tigress, torpedo, tough, tough guy, trigger man, ugly customer, vampire, violent, virago, vixen, wild beast, witch, wolf, yogini

For further exploring for "hellion" in Webster Dictionary Online