Zenki is among Enno Ozunu's most powerful warriors: the Demon God of Crimson Thunder Light in the Dark whose power is mainly sources from Thunder and Fire. In the early episodes, Chiaki needed to use the bracelet to transform Zenki into his true form - a giant defiant Demon Lord and a force to be reckoned with in battles. Zenki is undoubtedly powerful, yet rebellious. He can be quite reckless and naive, takes no one's order, and often prefers brawn over brains. In some cases, however, Zenki's anger allows him to transform into his true self. With the help of the bracelet and , Zenki's most faithful comrade, Chiaki is able to transform him into the Ultimate Demon Warrior. The bracelet is no longer necessary when Chiaki attains higher power in the final episode of the anime, after the bracelet is severely damaged, though this does not happen in the manga. Zenki loves eating the Karuma Seeds and switches to bananas when there's no seed.