Rantarō Inadera is a 10-year-old first-year student in the Ha Class at Ninjutsu Academy, hailing from Settsu Province. He comes from a common, nameless ninja lineage; his father is a working ninja and his mother a mostly retired kunoichi. Aiming to become an elite ninja and avoid unemployment like his father, Rantarō possesses reddish short hair, freckled cheeks, and wears distinctive round glasses due to astigmatism—a trait that inspired his name. His casual attire consists of a green and light green spotted top with blue-grey hakama. Energetic and kind, Rantarō often goofs off with his best friends Kirimaru Settsuno and Shinbei Fukutomi. Despite his determination to excel, he is easily distracted and prioritizes fun over studying. He excels at running due to his speed and enjoys drawing. As a member of the Health Committee, he is frequently subjected to bad luck. He participates in the mission depicted in *Gekijō-ban Anime Nintama Rantaro Ninjutsu Gakuen Zenin Shutsudō! no Dan*, joining the team assisting Sonoda Village after summer homework assignments are mixed up by staff, leading to a classmate's disappearance. Sonoda Village is troubled by a conflict between warring castles. Rantarō uses "boku" and "watashi" as first-person pronouns. His surname originates from a location in Amagasaki City.