Mirai Momoyama, a third-year student at Kirarigaoka Middle School, has light indigo eyes speckled with sky-blue flecks and long peach-pink hair styled in a curled ponytail. Her hairstyle includes shoulder-length forelocks, bangs split into three face-framing sections, and a single curled cowlick. She favors cute, feminine outfits outside her school uniform.

Radiating a sweet, energetic demeanor with a touch of clumsiness, Mirai often contemplates ways to cheer up her friends, deploying her inherited "Kira Smile" technique. Initially hesitant to take initiative, she evolves into a proactive figure during challenges like the Jewel Auditions and Princess Cup, while excelling at recognizing and amplifying others’ strengths.

As a Lovely-type idol under the Sweet Honey brand, her signature catchphrase is "Kiratto☆." She shares a deep bond with childhood friend Emo Moegi, who motivates her growth, and admires her manager Rinka Aoba. While viewing Anna Akagi as a talented rival, she maintains a supportive friendship with Sara Midorikawa and a first-name-basis closeness with Daia Nijinosaki, whom she actively befriended. Proud of founding KiracCHU, she credits the group as a cornerstone of her life.

Born on July 12th (Japan’s Decoration Cake Day), Mirai adores shortcake, eel, and ribbon-heavy fashion. Her hobbies include crafting sweets and creating humorously clumsy artwork. Notably, her sparkling expressions can soothe even crying children.

Sharing traits with Kanon—peach-pink ponytails, Lovely-type status, a younger sister (Hikari), and a pink theme color—Mirai uniquely diverges by avoiding rainbow-associated hues.