Botaro Ikawa, widely called Boo-chan or Bo-chan, is a five-year-old in Futaba Kindergarten’s Sunflower Class and an active member of the Kasukabe Defense Organization. His deliberate speech and nearly expressionless face conceal sharp intelligence and perceptiveness. Despite his calm exterior, he reveals unexpected depth through unconventional passions—collecting peculiar stones, probing urban legends, and studying mysteries like UFOs. He asserts knowledge of rare stone locations across Japan and routinely visits a local Kasukabe tatami shop after kindergarten to observe artisans at work. Physically, Bo-chan towers over his closest friends, largely due to his elongated head shape. A defining feature is the constant mucus trail from his nose, which he occasionally experiments with or plays for amusement. During group pretend-play, particularly games like house, he consistently chooses animal roles such as dogs or cats. Bo-chan shares a strong bond with Shinnosuke Nohara (Shin-chan), understanding and accepting Shin-chan’s quirks more deeply than peers. He frequently joins Shin-chan’s imaginative escapades, offering quiet support. His friendship with Masao Sato is especially meaningful; Masao recognizes Bo-chan as the one who best senses his emotions, often soothing him during distress. He also maintains warm ties with Toru Kazama and Nene Sakurada, with Kazama sometimes teased lightly about Bo-chan’s intellectual strengths. Family details are scarce. His mother appears briefly in the manga, shown sharing affection with him, while his father remains entirely absent from official media. An episode where Shin-chan, Kazama, Nene, and Masao investigate Bo-chan’s mother ends with them valuing his innate kindness over familial origins. Across films, Bo-chan serves as a supporting character. In *Crayon Shin-chan: Jungle That Invites Storm* (2000), he aids Shin-chan and friends in rescuing adults kidnapped by Paradise King’s monkeys during a cruise. *Crayon Shin-chan: Fast Asleep! The Great Assault on Dreamy World!* (2016) sees him morph into a rock during a dream battle, nodding to his geological interests. *Super-Dimension! The Storm Called My Bride* (2009) depicts an adult Bo-chan in his mid-20s as a roboticist and inventor.