Faust (ファウスト, Fausuto) is a medical genius gone insane and sane once more. Faust is probably one of the most unorthodox characters in the series. He made his first appearance in the first game, Guilty Gear, as Dr. Baldhead before hiding his identity and becoming Dr. Faust from Guilty Gear X onward.
He often behaves like a normal doctor, but in the battlefield, a crazy one, by using moves that make players with a sensitive case of laughter laugh themselves silly. However, despite his crazy style and wacky personality, he is someone who is loyal to his duties as a doctor and strives to help those in need, as a way to atone for his sins and past as Dr. Baldhead. He is also fierce towards enemies like I-No who is rather playful and sadistic to her foes, and does not hesitate to fight seriously if needed.