Konjiki no Gash Bell!!

Gash Bell

ガッシュ・ベル

Zatch Bell, known in Japan as Gash Bell (ガッシュ・ベル, Gasshu Beru), and Kiyo Takamine, known in Japan as Kiyomaro Takamine (高嶺清麿, Takamine Kiyomaro), are the primary protagonists of the Zatch Bell! manga and anime series. Brought together after Kiyo's father discovered a memory-wiped Zatch in an English forest, the duo serves as the central focal point of the narrative's emotional and action-driven arcs. While Zatch is a Mamodo child sent to Earth to participate in the once-per-millennium battle for the crown, Kiyo is a genius junior high student who serves as his human partner and "Book Keeper."

Bio from Fandom, licensed CC BY-SA