Hanzui, known as the "Evil Messiah" or "Dark Messiah," leads the Magnificent Ten, Big Fire's ruling council. He assumed leadership after Cervantes' death and succeeded Old Man Kawarazaki roughly a year before the main story. Overseeing Big Fire's operations alongside Chief Strategist Cho-Katsu Komei, Hanzui navigates tensions arising from their differing approaches.

Trained in mystical arts at the Jiizan monastery alongside Issei Doujin of the Experts of Justice, Hanzui broke the monastery's cardinal rules. This led him to abandon that path and join Big Fire. His mastery surpasses conventional sorcery, extending into reality manipulation and exceeding Issei's abilities. He notably transforms ordinary paper sheets into living warriors during combat. His primary weapons are enchanted Chinese coins arranged into coin swords, powerful talismans capable of diverse spells.

Despite his Big Fire affiliation, Hanzui exhibits honorable and noble traits, positioning him as an anti-villain. He serves as caretaker for Sunny the Magician, daughter of Magnificent Ten member Alberto the Shockwave. He typically wears a light pink cape over a formal business suit.

Within Big Fire, the Magnificent Ten operate with significant autonomy, provided their actions benefit the organization. Hanzui's tenure involves strategic oversight of large-scale projects like the GR initiative. His reality-warping abilities and tactical acumen make him pivotal in conflicts against the Experts of Justice, though his personal motivations follow a nuanced moral code rather than outright malice. The character does not appear in other continuities like the 2007 GR: Giant Robo series, while the manga "The Day The Earth Burned" presents an alternate storyline as a spiritual successor to the OVA.