Miyako Kōno, an Osaka native, speaks in a distinctive Kansai dialect. She presents as cheerful and lively, often acting as the group's mood maker. Her self-centered nature manifests as strong adherence to personal principles rather than selfishness, maintaining thoughtfulness toward others despite high self-esteem. She holds firm opinions and resists external influence easily.

Originally aspiring to be a fashion designer, Miyako possesses advanced sewing skills and won a national contest. She abandoned this path upon receiving an invitation from talent agency G.I. Productions, joining the idol unit to gain fame as a strategy to locate her absent father. She is the oldest of seven siblings from multiple marriages; her mother experienced four divorces. Miyako shoulders responsibility for her half-siblings while sharing an unusually close, joke-filled relationship with her mother, who supported her idol pursuit despite knowing her original aspirations.

During the Idol Tokyo Festival, Miyako organized an okonomiyaki party to strengthen group cohesion amid struggles with emceeing duties, an event prompting her to reveal her familial motivations. Her favorite foods—okonomiyaki and takoyaki—reflect her Osaka roots, alongside an affinity for Kansai comedy. She harbors fears of caterpillars, snakes, and silence.

Miyako exhibits impatience with Akane Maruyama’s indecisiveness and sternness but later reconciled with Nicole Saitō after initially resenting her criticism. Following a confrontation over dance abilities, Miyako apologized upon realizing Nicole’s dedication and accepted her guidance. Her extroversion fosters easy rapport with members like Sakura Fujima, whom she comforted during emotional distress, while she frequently engages in mutual teasing with Jun Toda.

Miyako officially graduated from the group on December 26, 2021, culminating her storyline. Her character was subsequently retired within the project’s narrative framework.