Okay.  Renegade.<br/><br/>His background involves being a nobleman on a Claixis Sector world, who served his house and for some time the inquisition as an assassin.  After some time battling Xenos for an unappreciative master and little acknowledgement, he gave into temptation and turned to the way of Slanesh.  Perhaps he has some interesting mutations.  (Minor psychic powers?  Multiple members?  Pharmacopic skin?  Detachable hand?)<br/><br/>