Mirai-mama is the mother of Mirai Momoyama and her younger sister Hikari Momoyama. She shares the family's indigo eyes and peach-pink hair, though her hairstyle is simpler and shorter than Mirai's distinctive ponytail. She possesses the powerful "Kira Smile," an expression Mirai inherited. While Mirai uses her smile to uplift others, Mirai-mama's Kira Smile flashes during moments of anger or frustration, demonstrating a contrasting application.

She co-runs a family food-related venture with her husband, Mr. Momoyama, also known as "Mr. Whip." As a parent, she supports Mirai's activities as an idol. Her younger daughter, Hikari, occasionally surfaces in connection to Mirai's idol endeavors.