Reina Miyama is a 14-year-old human female idol and student affiliated with Pretty Top and the group Prizmmy☆. Standing 162 cm tall, she holds the distinction of being the tallest member of Prizmmy☆. Her light auburn hair is typically styled in twin ponytails, complementing her gold eyes. She frequently wears blackish-pink headphones. Her casual wardrobe shifts seasonally: summer features a white undershirt, black jacket, red tie, and blue shorts, while winter sees a long-sleeved white shirt layered over a gray dress. Reina exhibits a sensible, level-headed, and reliable personality, often serving as a grounding influence for her teammates, particularly when tempering Mia Ageha's occasional recklessness. Despite her cool exterior, she possesses a warm and passionate inner nature. She tends to overthink situations, leading to worry, and exhibits sensitivity. A significant aspect of her personal life involves her unexpressed romantic feelings for Itsuki Harune, which frequently color her interactions. Residing in Tokyo, Japan, Reina's path to Prizmmy☆ began three years prior to the events of *Dear My Future* when she was part of the audience for Aira Harune's "Aurora Rising Dream" performance, an experience creating a subconscious link to her future teammates. Within Prizmmy☆, she contributes the strongest singing skills. She initially held the group's leadership role before Mia's arrival, leading to underlying tension stemming from Reina's perception that Mia underestimated the other members' efforts. This dynamic later evolved into a loyal friendship after Reina recognized Mia's genuine attitude. Her narrative prominently features conflict when her best friend, Puretty's Jae-eun, developed feelings for Itsuki. Struggling with her own feelings, Reina found it difficult to deliver Jae-eun's love letter to Itsuki, culminating in an emotional confrontation. This conflict resolved when Jae-eun found another romantic interest and Itsuki expressed admiration for Reina. As a Prism Star specializing in Cool-brand performances, Reina's signature Prism Jumps include "Heart-pounding Experience," "Crystal Splash," and later "Lovely Perfume Splash," the latter developed after using perfume created by Sho in a Prism Show. She performed the "Act Trying" while serving as the center of a show. During the formation of the unit Sprouts, Mion acknowledged her role as the "straight man" within the group dynamic. Her performance coords include the "Prizmmy☆ Night Star Vest" set for Prism Shows, the "Dance Butler" set for Sprouts, and seasonal event variations like "Halloween Pumpkin One Piece" and "Symphonia Tops of Wisdom." She appears in *Pretty Rhythm All Star Selection: Prism Show Best Ten*, a movie compiling notable Prism Shows from the franchise. Her surname "Miyama" derives from Japanese words for "deep" and "mountain/hill." Like her Prizmmy☆ teammates, her surname is inspired by a butterfly species, specifically the Aporia hippia. The character is based on Reina Kubo, the real-life leader of the group Prizmmy☆.