Hanako Mikado, Gao Mikado’s spirited younger sister and a third-year student at Aibo Academy, fuels her brother’s Buddyfighting journey with relentless cheer. Undeterred by skeptics, she rallies behind his matches, championing his efforts while idolizing Tasuku Ryuenji as a shared role model. Her vibrant connections extend to Gao’s allies—Drum, Bal, Batzz, and Chibi Panda—forging bonds as dynamic as her upbeat persona.

During Triple D’s events, she steps into the Buddyfight arena herself, honing skills through sparring sessions with Bal Dragon and competitive bouts. The World Buddy Championships Cup highlights her growth as a motivator, galvanizing Gao, Tasuku, and Gaito during critical battles.

Her development shines through mediating group tensions and demonstrating steadfast loyalty in crises. Later arcs briefly weave her into supernatural antics and comedic escapades, including an urban legend investigation, though documented specifics remain sparse.

Central to her narrative is an unwavering belief in Gao’s ideals and her drive to mirror his virtues. While rarely at the forefront of major conflicts, her enduring presence acts as an emotional anchor for her brother’s team.