Nakagawa Keiichi serves as Chief of the Kameari Park Police Station in Katsushika Ward, supervising officers including the troublesome Ryotsu Kankichi. He possesses a nervous, easily agitated personality, frequently erupting into high-pitched shouts, particularly directed at Ryotsu due to the officer's constant rule-breaking and disruptive antics. This causes Nakagawa significant stress, often manifesting as visible sweating and frantic movements. Physically, Nakagawa is distinguished by his prominent mustache and frequently wears glasses. He dons the standard police uniform befitting his rank. Despite his authority, he often appears overwhelmed by the chaotic events surrounding Ryotsu and the station's bizarre cases. He strives to maintain order and enforce procedures, but these efforts are constantly thwarted by the absurd situations he faces. Nakagawa deeply desires recognition and promotion within the police force, believing a well-run station is essential for this goal. However, the relentless disruptions, primarily instigated by Ryotsu, make this ambition seem perpetually elusive, fueling his chronic anxiety. He exhibits moments of pride regarding the station and its duties, though this pride is routinely undermined by daily realities. His leadership style is predominantly reactive, focusing on containing Ryotsu's antics and mitigating the resulting fallout. He relies heavily on shouting as a management tool, though it proves largely ineffective against Ryotsu's indifference. Nakagawa's character remains consistent, defined by his perpetually stressed state, loud reactions, and ongoing struggle to manage his subordinates and station. No significant long-term development alters these core traits.