Bo-chan, whose full name is Bo Suzuki, is a five-year-old boy and a classmate of Shinnosuke Nohara in the Sunflower Class at Futaba Kindergarten. He is a core member of the Kasukabe Defense Force, a small group of friends who often embark on adventures together. His background remains somewhat mysterious compared to his peers; while his mother has appeared on rare occasions, his father has never been shown, and many details about his home life are left intentionally ambiguous. He lives with his family in Kasukabe, a suburban city in Japan.

In terms of personality, Bo-chan is immediately recognizable for his quiet, slow-moving, and seemingly expressionless demeanor. He often appears to be daydreaming or lost in thought, speaking in a slow, deliberate monotone. However, this unassuming exterior belies a sharp and surprisingly intelligent mind. He frequently surprises his friends with deep insights, practical knowledge, and a mature perspective on complex or artistic subjects. He is unflappable, rarely getting upset or excited, and maintains a calm, accepting attitude even in chaotic situations. His most distinctive physical trait is a perpetual trail of mucus hanging from his nostril, which he can manipulate with conscious control for various tricks, much to the amazement and occasional disgust of his friends. His motivations are simple and intrinsic; he is driven by a quiet curiosity about the world, a deep appreciation for his hobbies, and a steadfast loyalty to his friends.

Bo-chan's primary role in the story of Crayon Shin-chan: My Moving Story ~Cactus Attack~ is as a key supporting character in the film's opening act. As the Nohara family prepares to move from Kasukabe to Mexico, Bo-chan is present with the other members of the Kasukabe Defense Force to see his friend off. His role is integral to the emotional weight of this departure, representing the home and friendship that Shin-chan is leaving behind. While the main plot follows the Nohara family in Mexico, Bo-chan's presence in the farewell scene underscores the significance of Shin-chan's bonds in Japan.

His key relationships are centered on the Kasukabe Defense Force. He is particularly close to Shin-chan, being one of the few characters who consistently understands and accepts Shin-chan's bizarre logic and unconventional play ideas without judgment. He willingly joins in Shin-chan's imaginative games, such as playing hide-and-seek without a seeker or pretending to play catch with an imaginary ball. He also shares a gentle friendship with the timid Masao Sato, often comforting him when he is upset. Bo-chan is generally well-regarded by the entire group, including the bossy Kazama Tooru and the strong-willed Nene Sakurada, for his reliability and level-headedness.

Throughout the series, Bo-chan shows subtle but consistent development, usually by revealing hidden depths. In the context of this specific film, his development is not a major focus, as his role is to provide continuity and emotional grounding. His character arc is largely static within this story, serving as a constant, reliable friend. His notable abilities are unusual and varied. His most famous skill is the masterful control of his runny nose, which he can use for entertainment or even as a practical tool. He also possesses a surprising amount of practical knowledge, including an ability to operate machinery like motorboats, which he demonstrates in other films. His greatest ability, however, is his quiet intelligence and his talent for disappearing into the background, allowing him to observe and assess situations that more boisterous characters might overlook.