Mia Ageha stars as the central protagonist in Pretty Rhythm: Dear My Future and later mentors aspiring Prism Stars in Pretty Rhythm: All Star Selection: Prism Show Best Ten. This 14-year-old Pretty Top talent leads the unit Prizmmy☆ and anchors the shuffle team COSMOs as their center. Her distinctive appearance features long wavy purple hair, often styled with a side bun secured by a pink ribbon, dark purple-red eyes, and a height of 160 cm. Her performance look swaps the ribbon for a signature red fluffy cap representing her pair charm, Mimmy. Brimming with energy and self-confidence, Mia communicates with trademark bluntness, frequently declaring "Mia is number one!", exclaiming "GA-GAAAAAN!" when shocked, and rallying with "Ki Do Ai Luck!" (Motivation Passion Love Luck). While her directness occasionally sparks misunderstandings or seems rude, she operates without malice and adheres strictly to rules. An unshakeable optimist who uplifts others, she holds deep reverence for the legendary Prism Star Aira Harune despite initially challenging her. Her burning drive to become the best fuels her actions, causing early friction with teammates until her inherent selflessness bridges those divides. Her journey ignited at age 11, witnessing Aira Harune perform the Aurora Rising Dream during the Prism Queen Cup. Cheering passionately from the audience alongside future Prizmmy☆ members Karin, Reina, and Ayami—though formally meeting them only three years later—this moment crystallized her dream of stardom. Her story launches dramatically when she interrupts a MARs Prism Show to directly challenge Aira. This bold act secures her a place at Pretty Top under Jun Takigawa's mentorship, grouping her with Reina, Karin, and Ayami. Early tensions flare over Mia's perceived selfishness, notably during their first Fan Call collection. While teammates vote solely for themselves, Mia exclusively votes for them. This selfless act prompts heartfelt apologies, forging stronger bonds and enabling their official debut as Prizmmy☆. Key relationships include her enduring bond with Korean childhood friend Hye-in, contacted immediately after joining Pretty Top, and her comedic romantic interest in the masked Prism Ace, unaware of his identity as Jun Takigawa. Her partnership with Mimmy provides constant motivation and symbolic guidance during performances. As a mentor in Prism Show Best Ten alongside Aira and Naru Ayase, Mia guides Laala Manaka, sharing pivotal experiences like her challenge against Aira and the completion of the Grateful Symphonia with Prizmmy☆, PURETTY, and MARs. Her performances are featured in the film's "top ten" ranking Prism Shows, though specific ranks remain undisclosed. Mia consistently performs using the "Sexy" brand type, marking her as the first series protagonist to diverge from the "Lovely" archetype. Significant coords defining her arc include her Prism Show coord (Prizmmy☆ Sunshine Vest/Skirt), COSMOs coord (Strawberry Idol set), and Grateful Symphonia coord (Symphonia Headband/Dress/Boots), alongside others detailed across various events and episodes.