Jack is rude and single-minded, focused solely on his quest to kill Chaos, often interrupting others or dismissing them outright when they present information he deems irrelevant to this goal. Even with allies, he's blunt and taciturn, preferring not to mince his words or embellish the truth. Jack is often brutal in combat, even deriving pleasure from defeating and destroying strong opponent. Occasionally he uses crass language to address his enemies.