Chrexis

A mysterious Keyblade wielder responsible for bringing Chrislma into the Wasteland. A Keyblade wielder of darkness, he battles to become more stronger and has learned how to control Heartless to some extent. He tainted his own Keyblade with darkness so that it would not choose another wielder, which was smart, by the way. He betrayed his friends once to join the dark side.

In Wasteland
Not much is known about Chrexis at this point, but from the looks of things he appears to be a denizen of the Wasteland, meaning he is a forgotten character.