Xavier Reese is a Evanidus (teleportation) . He can teleport for short distances, including through walls and other solid objects, which makes him rather powerful. He is first seen in Stolen. After being captured, the workers at the compound quickly discovered that "walls cannot hold Xavier." However, he agreed to work for the humans responsible for kidnapping supernaturals. He gives Elena Michaels advice and helps her a couple times, before taking off himself, knowing his time was running out.
He is seen again in Broken, where he offers to help the Werewolf pack capture a Mutt, in return for stealing the From Hell letter written by Jack the Ripper.