Miki is a secondary character in the City Hunter series. Her background begins in a war-torn environment where she was discovered as an orphan by Umibozu in a completely destroyed village. Contrary to his usual nature, Umibozu took her in and trained her in combat and survival skills, effectively raising her on the battlefield. She grew into a highly capable former mercenary and female commando, hardened by her experiences.

Physically, Miki is a young woman in her early twenties, with upper-back-length dark-violet hair featuring bangs falling over her left side, and blue-grey eyes. She operates the Cat's Eye coffee shop alongside Umibozu, a location that serves as a hub for the characters.

Her personality is open and friendly, and she forms close bonds with others easily. She is fiercely devoted to Umibozu, having fallen in love with him during their time together. Her primary motivation is to marry him, and she actively pursues this goal, reappearing in Japan to stay close to him. Her persistence pays off, and by the conclusion of the manga series, she and Umibozu are married.

Within the story, Miki serves as a supporting character who contributes both combat support and emotional depth. She develops a strong friendship with Kaori Makimura, working behind the scenes to help strengthen the bond between Kaori and Ryo Saeba. Her relationship with Umibozu is central to her role, and her presence provides a contrast to the more chaotic antics of the main duo.

Miki is battle-hardened from her upbringing and is a skilled fighter in her own right. She also possesses mastery of hypnosis, an ability she can utilize in combat or other situations. Her development is marked by her transition from a war orphan raised on the front lines to a woman who finds a stable life running a coffee shop alongside the man she loves, ultimately achieving her goal of marriage.