Boo-chan, alternatively known as Bo Suzuki or Botaro Ikawa, is a five-year-old in the Sunflower Class at Futaba Kindergarten in Kasukabe. He moves slowly and appears expressionless, yet exhibits unexpected intelligence, especially regarding artistic topics and adult subjects. His passions include collecting stones, investigating urban legends, and studying mysteries like UFOs. He claims knowledge of a Japanese location harboring exceptionally rare stones. Though he speaks at a sluggish pace, his insightful observations frequently surprise peers. A defining trait is his perpetually runny nose, whose mucus he manipulates for tricks. During group games like playing house, he consistently volunteers as a pet dog or cat. After kindergarten, he often observes craftsmen at a local Kasukabe tatami mat production store. He belongs to the Kasukabe Defense Organization alongside Shinnosuke Nohara (Shin-chan) and classmates. Among Shin-chan's friends, Boo-chan displays the deepest understanding of Shin-chan's behavior and remains the most passive and accepting toward him. He regularly joins Shin-chan in unconventional activities, such as hide-and-seek without a seeker or imaginary ball games. His friendships include comforting Masao Sato when he cries, engaging with Toru Kazama (whom Shin-chan teases by suggesting Boo-chan is smarter), and sharing mutual support with Nene Sakurada. Family details are sparse. His mother appeared once in the manga, depicting a loving relationship. His father remains unseen in official manga or anime. He has a sister named Nisu Suzuki. Physically, he stands as the tallest in the Kasukabe Defense Force due to his head length, though the height difference with peers is minimal. In the movie *Crayon Shin-chan: Roar! Kasukabe Animal Kingdom*, Boo-chan ingests an incomplete animalization serum from antagonist group SKBE, causing partial transformation into an animal while retaining his human head. Sources cite varying animal forms—bat, penguin, rabbit, or pangolin. Maintaining human consciousness, he aids Shin-chan in halting SKBE's plan to animalize humanity, leveraging his new abilities during their mission. The 2025 film *Crayon Shin-chan the Movie: Super Hot! The Spicy Kasukabe Dancers* depicts a dramatic transformation during an India adventure. A mystical incident involving a nose-shaped backpack and paper inserted into his nose halts his signature runny mucus. His demeanor shifts from gentle and slow to sharp, intense, and tyrannical—earning the moniker "Bo-kun." This altered version coldly rejects Shin-chan's assistance, questioning his understanding. The core conflict revolves around reversing this change to restore his original personality and physical traits.