Koko, legally named Kyoko Kano, forms one half of a celebrity duo portrayed as secret agents. Inspired by the real-life Japanese media figure Kyoko Kano, her anime adaptation simplifies her name to "Koko" for English-speaking audiences. With her sister Mika, she harnesses the Booby Stone’s power to preserve eternal youth and beauty, facilitating their opulent lifestyle and covert missions.

Physically, Koko features vivid red hair, an hourglass silhouette, and prominently exaggerated breasts. Her signature outfit comprises a cleavage-window minidress, high-heeled boots doubling as combat stilettos, and flamboyant jewelry. Limited wardrobe options ensure this design persists across all appearances.

As an operative, Koko wields "boob-based powers" derived from the Booby Stone. These include breast expansion for defense, breaking restraints, or offensive strikes. Her primary ability, the "Emergency Abunai Alarm," triggers a threat-detection alert from her chest. Skilled in physical combat, she employs tactics like provocatively shaking champagne bottles to disarm foes.

Personality-wise, Koko displays pronounced egotism, habitually showcasing her fame and physique. She shares a telepathic-level bond with Mika, resulting in synchronized speech and movements. Their conversations fixate on fashion, male attention, and upholding their glamorous image. Koko consistently prioritizes safeguarding the Booby Stone from adversaries Madame Hokuroda and Paparazzi Matsumoto.

Throughout the series, Koko’s characterization remains static, anchored in vanity, dependence on the Booby Stone, and repetitive thwarting of identical heist plots using breast-centric abilities. Her background is confined to her celebrity inspiration and current secret-agent role.

Koko and Mika operate as an inseparable unit. Their confrontations with antagonists involve foiling theft schemes via comedic mishaps, exploiting Matsumoto’s breast obsession or Hokuroda’s flawed strategies. No expanded lore exists beyond the core narrative.