Miyako Tarōmaru acts as the adviser for the badminton club at Kitakomachi High School. She is 31 years old, sporting medium-length pink hair that falls nearly to her shoulders. While depicted in various outfits throughout the series, her typical attire consists of a short-sleeved top and a long skirt.

Her personality blends pragmatic and occasionally self-interested traits with moments of dependability. She demonstrates greed by promptly requesting a bonus from the school principal following the badminton club's advancement to the prefecture semi-finals. Miyako also struggles with navigation; an unclear map she provided leads to Ayano Hanesaki getting lost during a training camp. Despite her limited knowledge of badminton strategy or techniques, she exhibits reliability in interpersonal contexts, such as offering parenting advice to Uchika Hanesaki.

Miyako originated as a character in the author Kōsuke Hamada's earlier work, "Pajama na Kanojo," before transferring into the setting of Kitakomachi High School. Across the anime, manga, and related media, no significant character development, backstory expansion, or additional narrative contributions beyond her advisory role are documented.