Katsuya Serizawa works in Spirits and Such as an apprentice of Reigen Arataka, alongside Shigeo Kageyama. He wears a blue suit, and has black hair and eyes. Even being a strong Esper and having powerful abilities, he's a hopelessly awkward individual who struggles with interacting socially. Actually, despite sometimes looking intimidating, Katsuya is an actual softie. He's a good and caring boyfriend, who tries his best.