Hattori Hanzou is a ninja of the pure line of the Hattori clan. In spite of his high position, he left his clan to live in Academy City while hiding his identity and status as a ninja. He ended up joining the biggest Skill-Out faction under Komaba Ritoku's command and befriending both Komaba and Hamazura Shiage. After Komaba's death and Hamazura's adbication Hanzou became the next leader of their Skill-Out faction. Despite having parted ways he's still friends with Shiage and has helped him in occasion. He also temporarily took over Komaba's role in protecting Fremea Seivelun from harm.