The character most commonly known as the Chief Inspector is Inspector Natsuko Aki, though she is typically referred to by her rank of Inspector rather than Chief Inspector. In the narratives where she appears, she is a determined officer of the Metropolitan Police Department, often assigned to the 8th Division of the Public Security Department. Her position places her at the forefront of the law enforcement effort against the Panther Claw criminal syndicate, a responsibility she takes seriously despite the overwhelming power of her opponents.

Natsuko Aki is characterized by a strong-willed and fearless personality. She possesses incredible accuracy with firearms and is known for her courage, remaining composed even in extremely dangerous situations often described as raining bullets. Initially, she presents as a harsh and no-nonsense individual who strictly adheres to the principles of law and order. This rigid mindset makes her deeply skeptical of vigilante justice, leading her to pursue Cutie Honey as a person of interest alongside her investigation of Panther Claw. She sees Honey as an unknown variable that operates outside the law, which conflicts with her professional duty.

Her primary motivation is to dismantle Panther Claw and bring its members to justice through proper legal channels. As a police inspector, she is driven by a sense of duty to protect the city and uphold the law. However, her role evolves significantly through her interactions with Honey Kisaragi, the heroine behind Cutie Honey. Upon discovering Honey's true identity as an android created by a murdered scientist and her quest for revenge, Natsuko's perspective begins to shift. The initial antagonism gives way to a protective and supportive alliance. She becomes a crucial emotional anchor and tactical ally for Honey, moving from a pursuer to a trusted confidante who offers a place to stay and physical care.

This relationship is central to the character's development. Natsuko learns to reconcile her ideals of upholding the law with the necessity of accepting help from someone like Honey, who operates outside those boundaries. Her dedication to Honey proves critical in the final confrontation with the syndicates leader, Sister Jill. At a pivotal moment when Honey is about to be absorbed, Natsuko takes action that saves her, demonstrating that their bond has surpassed any procedural or ideological misgivings. Following the resolution of the conflict with Panther Claw, Natsuko solidifies her partnership with Honey by co-founding a detective agency with her, marking a transition from a formal law enforcement role to a collaborative pursuit of justice. Beyond her marksmanship, no other supernatural or hyper-advanced abilities are detailed, her strength lying in her determination, investigative skill, and personal loyalty.