Note i'm still trying to tweak this. As I'm reading the manga (at vol 8) and as i do things begin to get mixed together. =p

Dark first appeared over 40 years ago in the body of Daisuke's grandfather: Daiki. Dark is very outgoing, a woman magnet, and puts everything into getting the artwork. Also known as: the Legendary Phantom Thief, he's known for stealing priceless artifacts from the most dangerous locations. Since Dark is part of Daisuke they first have a rough relationship, which soon becomes easier for both.

Nobody knows who Dark really is, or why he steals the artworks. The Niwa family seem to be the line to which the males become Dark at the age of 14. So when Daisuke feels the emotion of Love he changes to Dark.

However as soon as Daisuke declares his love to the one he truely loves, Dark will leave him.

Has a familiar that gives him wings, With.