Kyôko Milchan is an auditor and accountant for the Special Services division of Judoh's Bureau of Urban Safety. She manages the division’s budget, handles daily administrative affairs, and ensures the proper submission of activity reports. With pink hair and green eyes, Kyôko is strait-laced and conscientious, adhering strictly to rules and procedures. She often admonishes colleagues for their unconventional methods, acting as a voice of reason and experiencing stress when others disregard protocol.

She initially held a crush on Shun Aurora, the Bureau's General Manager and brother of her colleague Daisuke, though her feelings gradually shifted toward Daisuke over time. Kyôko demonstrates capability beyond her administrative role, taking direct action in the field on at least one occasion. Her dynamic with Daisuke evolves from professional frustration to a more personal and caring relationship.

A notable difference exists between her portrayals in the anime and manga. The manga depicts her becoming more focused on her appearance, such as dieting to fit into a bikini for a pool party to impress her crush. This contrasts with the anime’s emphasis on her intelligence and professional competence. Kyôko provides logistical support and information to field operatives, making her an integral part of the team’s operations.