Honoo serves as a supporting character and supernatural companion to the central duo. He strategically deploys a combat transformation into an adult form, wielding fire powers against threats like mummies and guardians encountered during expeditions. This grown-up state protects the group, especially in critical moments within locations such as the London pyramid. His standard appearance remains youthful, contrasting sharply with his combat form. Honoo operates alongside his elemental companion, Yuki; both frequently intervene to ensure their allies' safety against pursuing supernatural threats, engaging in direct confrontations that advance the group's objectives. Specific traits include a facial mark and distinctive earrings. While his elemental affiliation grants fire manipulation, his origins, personal motivations, or development beyond observed combat and support functions are not explored within the narrative. He consistently fulfills his role within the team structure during quests.