Keiichi Nakagawa works as a patrol officer at the Kameari Park Front Police Box. He hails from extreme wealth as the son of the Nakagawa Corporation CEO, inheriting vast family resources. This affluence enables luxuries like ordering ice from Fiji for immediate helicopter delivery. Despite his privileged background, Nakagawa demonstrates a professional work ethic and dedication to his police duties, earning respect from his superior, Daijiro Ohara. Nakagawa wears an expensive custom-made yellow pinstripe police uniform designed by Pierre Cardin, comprising pants, a coat over a white undershirt, and a red tie with black diagonal stripes. This uniform changes seasonally, switching to short sleeves without an undershirt or tie in summer. His typical transportation is a bright red Ferrari, reflecting his affluent lifestyle. He resides alone in a palatial family mansion staffed with servants, as his parents and younger sister remain largely absent due to demanding careers—his mother as an international singer/pianist and his sister as a busy fashion model. This family separation causes Nakagawa periodic sadness and near-breakdowns when attempts to reunite with his father fail. Personality-wise, Nakagawa presents as even-tempered, cooperative, and sensible, often acting as a voice of reason against Kankichi Ryotsu's reckless schemes. He possesses expertise in business and finance but displays naivety about everyday life outside his elite upbringing. Occasionally, consecutive failures or heavy alcohol consumption trigger an uncharacteristically eager side. He shares significant similarities with colleague Reiko Akimoto, including mixed Japanese-French heritage, extreme wealth, specialized education, and parallel approaches to problem-solving. Nakagawa maintains a steady friendship with Ryotsu, frequently providing advice or material support via Nakagawa Corporation employees, though he consistently fails to deter Ryotsu's questionable plans. His interactions with Reiko reflect mutual understanding due to their shared background. While emotionally affected by family estrangement, he channels his loneliness into dedication to police work and colleagues. A notable incident involved female singer Ami Onuki guest-starring in a chapter after expressing admiration for Nakagawa, causing surprise among colleagues and jealousy from Ryotsu.