Little is known of the Harlequin of Night.
- He appeared in London in July 2016, although he does not appear to have any connection to Case File: Fall of House Pendragon .
- He is almost certainly a White Court Vampire
- He has gathered together a horde of homeless children and other waifs, turning them to vampirism. His signature mark turns their eyes jet black
- He has embraced Argus the Eye Thief