Walker is the vigilante warden of the large prison in the Ghost Zone, where he imprisons the inhabitants for minor offenses.
Walker is extremely strict and a stickler for his rules, always seeking to punish those who defy them. He commands his prison and minions with an iron fist and goes to whatever measures he has to in order to preserve order, even making up laws as he goes along. He also shows signs of being a coward by having a Wulf wear an electrical collar and almost putting the collar on Sam.