Fallen/Possesed Jedi [Evan Black]

A character of one of my PC's has recently been possesed by the spirit of Darth Plagius. He has since given himself to the dark side and has started to wield a second rune covered lightsaber.

The original character is here: http://i164.photobucket.com/albums/u13/acheronseven/MerrickRein.jpg

My player says he now imagines Merrick to be wearing a black cape and black robes. He and I are open to any creative license brought to the piece though.

Thank you, in advance, to anyone who takes the time to look at this.