Zack is a vulgar and chaotic man. He's temperamental and prone to fits of rage and is shown to be violent. He's unable to control his murderous impulses and, in general, comes off as impulsive. When he's in a murderous state, he becomes your typical crazy serial killer; bloodthirsty, ruthless, and eager to kill. He's aware that these traits have culminated in people viewing him as a monster. When he gets the urge to kill, he becomes giddy and uncontrollably violent.