Kankichi Ryotsu serves as the primary patrol officer at the Kameari Park police box. He sports a short, robust build, a crew-cut, thick body hair, visible stubble, and a signature unibrow forming a distinctive 'm' shape. His standard police uniform consists of blue pants and coat over a white buttoned shirt with a black tie, consistently worn with sleeves rolled above the forearms and wooden sandals instead of regulation shoes. Off-duty, he typically wears casual shirts and pants, switching to island shirts, shorts, and sunglasses in summer. Born and raised in Asakusa, Tokyo, his childhood involved mischievous activities like climbing factory smokestacks and hijacking bridges, earning him the negative local perception of an "uncivilized caveman" – a strained relationship that persists with residents Komachi Ono and Naoko Seisho. His family includes a contentious relationship with his father Ginji, marked by frequent arguments despite shared traits, and a calmer dynamic with his mother Yone, who mediates. His younger brother Kinjiro contrasts him with higher intelligence, business success, and marital stability. Ryotsu's personality combines laziness during police duties—sleeping, playing games, or building models—with an aggressive pursuit of money-making schemes involving inventions or trend exploitation. These ventures often start successfully but collapse catastrophically, causing property damage or reputational harm to the police force. Despite poor financial management, he possesses deep knowledge of Japanese culture, excelling in traditional practices such as shogi, beegoma, and kendo, alongside modern trends like video games and smartphone apps. His physical capabilities include superhuman strength, stamina, and remarkable running speed even in sandals. Linguistically, he is limited to Japanese, using minimal English phrases like "thank you" and relying on colleagues for translation. Interpersonally, he maintains a turbulent yet paternal dynamic with his superior Daijiro Ohara ("Bucho"), who frequently reprimands him with shouts of "Baka Mon!" for neglecting duties but harbors underlying paternal concern and pride in his policing successes. Their history extends to Ryotsu's youth, when Bucho arrested him for public drunkenness, later inspiring his career choice and gifting the sandals he still wears. His collegial ties include Keiichi Nakagawa, whose global perspective contrasts Ryotsu's localized worldview; their friendship involves collaboration but also friction over Ryotsu's schemes and Nakagawa's wealth. Interactions with Reiko Akimoto blend casual workplace rapport—sharing tea and discussions—with gender-based humor, including comedic reactions to accidental nudity. Transgender officer Ai Asato harbors romantic feelings toward him, initially reciprocated until awareness of her background shifted his view to platonic friendship. Motorcycle officer Hayato Honda serves as a frequent accomplice, addressing him respectfully as "senpai" outside his aggressive riding persona. Within the 1999 film narrative, Ryotsu partners with FBI agent Lisa Hoshino to counter terrorist attacks targeting Shinatora Corporation buildings by the antagonist Benten. The 2016 special features him rescuing Princess Sabrina after her kidnapping in Japan. Both scenarios align with his pattern of unconventional police work amid crises.