A guard at a notorious prison. He tries his best to maintain a cold wall to avoid falling for the prisoner Joker's seduction. However, he is unaware that his feelings are becoming real. He has high pride in many areas and possesses narcissistic tendencies. This is mostly highlighted when he bickers with Joker; his actual first impression is quite polite and kind. Looking at his actions, while he thinks highly of himself, he doesn't go as far as openly comparing others to himself. He is deeply affectionate toward those he has acknowledged. If he stays angry for more than 5 minutes, he collapses from a high fever, which causes his assistant, Dark Eye, to worry. He secretly enjoys playing pranks. Even if he lies to or deceives others, he insists he never lied, but simply didn't say anything. He has the least attachment to family and rarely cries. He is the most mature character. After becoming an adult, he overcame his timid and dark past to become cheerful. He laughs more than anyone and has changed into a personality with high self-love. Still, he is more timid and meticulous compared to Joker, and he was initially interested in Joker because of the prisoner's looks.