Boo-chan, alternately known as Bo-chan or Botaro Ikawa, features in "Crayon Shin-chan: Dengeki! Buta no Hizume Daisakusen" as a Futaba Kindergarten child entangled in the central conflict. He joins Shinnosuke Nohara, Masao, Nene, and Kazama dining aboard the secret society Pig's Hoof airship. When agent Orioke hides on their houseboat after stealing a vital weapon disk, the group becomes hostages and is captured on the airship. During transport toward Pig's Hoof headquarters near Lake Manasarovar, Boo-chan accompanies the children. After an escape attempt over the Tibetan plateau, he journeys with them to the headquarters, uncovering a secret entrance to Dr. Obukuro's laboratory. They reunite with Orioke but face capture through surveillance systems. Boo-chan persists with the group through the climax, witnessing the clash with antagonist Mouse and a computer virus activation. He escapes headquarters during its self-destruct sequence aboard an overloaded airship, later pushed to safety by an illusionary figure. His film portrayal reflects established series traits: a calm, observant child whose presence bolsters the group dynamic, though the movie emphasizes collective action over individual moments. Across official media, he recurs in Shin-chan's friend circle and the Kasukabe Defense Organization, marked by slow speech, constant nasal mucus, and niche interests like stone collecting and urban legends. Despite his reserved nature, he displays unexpected insight. Family background receives minimal exploration—his mother appears once, his father never depicted. In the future-set "Super-Dimension! The Storm Called My Bride," Boo-chan appears as a mid-20s roboticist or inventor.