Comment Ringwraith, of course (Score 2, Insightful) 481
Because unlike the rest of the options they are kickass bastards that command whole armies.
Zombies and mummies are mere henchmen usually, while vampires and werewolves usually hide from the world in remote castles, caves or abandoned houses.
Necromancers are somewhat better, but still no match for ringwraiths who are basically royalty.
Haven't heard of demon penguins before (which probably means they are in the zombie+mummy category of lesser beings).