Nagamasa Gadou serves as a Promoter and the commanding leader of the Civil Security Division during the Third Kanto War, holding the title of Adjuvant Supreme Commander. He is partnered with the Initiator Asaka Mibu, and the pair holds an IP rank of 275 at the start of the conflict. Gadou is an experienced and capable leader who carries a sword forged from Varanium and is recognized as an excellent swordsman. He wears armor styled after the Sengoku period and is bald with blue-green eyes. His personality is marked by calmness and composure under pressure; he is a decisive strategist who evaluates the strengths and weaknesses of opponents quickly and inspires those under his command. Despite his stern appearance, he harbors a protective soft spot for children, especially those who have lost their families to the Gastrea threat, and he takes a personal interest in the safety and training of young Initiators such as Enju Aihara. His motivations are driven by a belief in the potential of people rather than reliance on cursed children alone, and he carries his responsibilities with seriousness. Gadou has a son named Hidehiko Gadou, whom he encouraged to become a Promoter and civil officer. Within the story, he occasionally clashes with Rentaro Satomi over differing approaches, but his leadership and tactical acumen make him a central figure in the defense of Tokyo during the war. His notable abilities include expert swordsmanship, practical battlefield command, and the discipline to adhere to rules and regulations while focusing on logical, stable solutions.