Honoo serves as a subordinate to the vampire Mosquiton, carrying out tasks that advance his master's goals. He is one of two elemental beings commanded by Mosquiton, alongside Yuki, their abilities frequently employed during confrontations or challenges faced while seeking the O-Parts.

Brown-haired and red-eyed, Honoo bears a distinctive dot on his forehead. His supernatural nature grants him fire manipulation, a power regularly used in combat or to remove obstacles. He can transform into an adult form, enhancing his effectiveness in engagements, such as incinerating adversaries like mummies during the London pyramid incident.

His story involves accompanying Mosquiton and Inaho Hitomebore on adventures across locations including London, the Indian Ocean, and Shanghai, driven by Inaho's quest for the immortality-linked O-Parts artifacts. Honoo participates in action, strategy, and problem-solving during these expeditions, aiding in infiltrating restricted areas or confronting rivals like Count St. Germain and Rasputin.

He operates in consistent partnership with Yuki, their elemental powers complementing each other on missions. Honoo follows Mosquiton's orders, frequently responding to Inaho's demands due to Mosquiton's blood contract with her. This includes tolerating Inaho's unpredictable behavior and adapting to sudden changes she instigates.

Details regarding Honoo's origins, specific history beyond his service, or significant character development are not provided. His documented role focuses on supporting the primary characters through his fiery abilities as a member of Mosquiton's retinue throughout their exploits.