Matsuri Hibino is a 13-year-old first-year junior high school student whose life revolves around Primagi stage performances and festivals. Her full Japanese name, 陽比野まつり, reflects her nature: the surname Hibino (陽比野) combines characters for "sunshine," "contest," and "field," while her given name Matsuri (まつり) means "festival." She possesses blue eyes and shoulder-length orange hair, typically featuring a braid on the right side, and stands 160cm (5' 3") tall. Transforming into a Primagista dramatically alters her appearance: her hair grows long, shifting to a hot pink base accented by peach-orange highlights and pastel blue streaks, with shorter tufts forming in her forelocks. Cheerful, kind, and light-hearted, Matsuri also displays responsibility and maturity. She exhibits intense excitement and determination, especially concerning Primagi, driven by her dream to become "the coolest version of herself" through performance. Her Primagi journey starts when magician Myamu, from another world, scouts her after overhearing Matsuri hum "Believe" near Prism Stone. Though initially hesitant, Matsuri partners with Myamu, later recalling a childhood encounter where Myamu, disguised as a cat, comforted her when she was lost in a forest. Relationships shape Matsuri's growth. She shares a friendly rivalry with childhood friend Toma Ibuki and admires top performers Hina Yayoi and Jennifer Sumire Sol, the latter inspiring her to become a Primagista. She supports fellow beginner Lemon Kokoa in overcoming stage fright. Partnered with Auru Omega in the Techno Magical unit, Matsuri focuses on helping Auru enjoy Primagi. Unfazed by Miruki Amauri's occasional meanness, she finds Miruki consistently cute. Matsuri also openly admires Amane Sumeragi alongside her peers. Her preferred Primagi brand is LOVELY MELODY. Her theme color is fresh pink, and her favorite foods include yakisoba and candy. She shares her August 8 birthday, placing her under the Leo zodiac sign, with Myamu and characters from related series.