Daryll "Dark" van Fallun is a Creator, a creature which makes our universes... He's one of MANY Creator's in fact. He was the leader of a band of Creator's who wished to rise above the higher beings and take control over time and space. However, he was caught, his power taken and broken apart, scattered throughout his universe, and finally banished to his final creation: Earth.
Upon his arrival, he noticed how quarrelsome and cruel his creations were. He decided to gain his power back anyway possible to fix what he'd done and take down those who turned against him...
Thankies. He's the one who I really had to put a back story on, cause I didn't want people to think "Oh he has a werewolf and a vampire in his story. Must be a Twilight fan." No, Dark's appearance is based on the descriptions of the Other Parents in the book version of Coraline. Used the Other Mother's description especially: "taller and thinner, skin white as paper and black hair which moved like undersea plants." That's where his design stems from.