Kiyomi Mashiro is a teenage girl with short black hair, typically wearing a white long-sleeved t-shirt, a blue skirt, and a blue headband. She wields Kagura suzu as her tool to battle onis.

Her personality is cheerful and fun-loving; she often enjoys peaceful activities with friends. When confronting onis, she displays significant determination as a fighter maiden, contributing to their defeat and safeguarding Japan. She serves as the director of Sakuragaoka Gakuen's "Showa Pops Club." Her debut as a Utahime occurred after Utahime Dream officials scouted her during the "Showa Pops Koshien" event she hosted. Her overwhelming personality earned national support and numerous commercial contracts.

As an idol, she demonstrates musical proficiency through singing and dancing for live audiences, requiring peak human stamina and group coordination. Her mastery of singing allows her to sway audience emotions, achieve perfect pitch, replicate any song, and produce complex vocal notes effortlessly. Her original song releases include "Nogiku Ichirin," "Sailor Fuku to Kikanju," "Hello Good-Bye," "Yasashisa Kamishibai," and "Asamade Odorou." A potential personal skill involves baking, though its manifestation remains unspecified.

In her role as a fighter maiden, she participates in battles against supernatural threats, specifically targeting onis for elimination. Her activities blend performance artistry with combat responsibilities.