Nico is a male wizard who has learned to use magic and serves as the headmaster of his own wizarding school. He was cursed by the witch Sadé with immortality and an eternally youthful appearance, meaning he does not age and retains a childlike look despite being much older. As an immortal sorcerer, Nico possesses extensive magical knowledge and skill, which he uses to guide others. His primary role in the story is as a mentor and resource for the Duke and Alice as they seek to break the Duke's curse. Nico helps train and drill the main group, including Zain and Cuff, preparing them to face Sadé. He also teaches Zain how to transport others through time and open portals. Nico is deeply tied to the history of the curse, as he was cursed by the same witch who cursed the Duke, giving him a personal stake in the conflict. His personality is presented as knowledgeable and authoritative, befitting a school headmaster, though he also shows a willingness to assist and instruct others. Key relationships include his protégé Free, a witch who greatly admires and addresses him as Brother Nico, attempting to emulate his appearance. Nico also works alongside Ichi in training the crew. Over the course of the story, Nico's guidance proves essential in advancing the Duke and Alice's journey, and his own past with Sadé provides crucial context for understanding the curse. His notable abilities include mastery of magic, the power to open portals, time travel transportation, and the capacity to improve the skills of other witches and wizards through rigorous training.