Tomoya Mashiro is a 15-year-old student and idol, leader of the unit Ra*bits. He stands slightly shorter than average with an average build, short dirty blonde hair, dull brown eyes, and thick eyebrows. His standard school attire includes a white shirt with an unbuttoned collar, a red or blue tie, a beige vest with black stripes, an open blazer, and orange sneakers. For Ra*bits performances, he wears a light blue and white sailor-style outfit featuring a blue bow, gold accents, rabbit-themed charms, and brown boots; this costume maintains a youthful, thematic aesthetic despite evolving designs across series iterations. Born on March 29, he comes from a self-described ordinary family that "blends into the crowd," known for habits like shopping during sales. He has a younger sister for whom he prepares lunch when their parents are busy. His surname, meaning "pure white" or "blank slate," reflects a recurring motif in his characterization as adaptable. The "Tomo" in his first name means "friend," aligning with his relational focus. Tomoya's personality blends seriousness, determination, and blunt honesty. He acknowledges his lack of innate talent but exhibits stubborn resilience in pursuing goals, especially in idol work and theater. Harboring a persistent inferiority complex and viewing himself as average, he maintains a pessimistic self-view that fuels rigorous self-improvement. He idolizes figures like Hokuto Hidaka, Nazuna Nito, and Wataru Hibiki, emulating their traits to aspire to their level. This hero-worship manifests as passionate defense of loved ones against perceived unfairness, though he is reluctant to seek help for his own struggles, striving to appear strong like Nazuna. His background includes a longstanding friendship with Hajime Shino since middle school. Together, they once infiltrated Yumenosaki Academy in fake uniforms to watch Wataru perform, encountering Nazuna and hearing Valkyrie's impactful live set—their only such adventure due to Hajime's guilt over deception. Tomoya later joined Ra*bits under Nazuna's mentorship, initially as a temporary leader before solidifying the role permanently. His development emphasizes growth from self-doubt to leadership: he studies theater to hone expressiveness, researches diverse idols for inspiration, and gradually embraces his capacity to anchor others during crises. His adaptability remains a key strength, allowing him to stay level-headed in chaos and flexibly adopt varied roles. Within Ra*bits, Tomoya balances unit dynamics—acting as "impulse control" for the energetic Mitsuru Tenma, supporting the anxious Hajime, and respecting Nazuna's guidance. Early narratives highlight his frustration at being labeled "ordinary," a trait Nazuna provocatively emphasized to motivate him. Over time, he internalizes Ra*bits' mission to deliver "love, healing, and smiles," channeling his warm singing voice and earnest energy into performances. His relationships extend beyond the unit, including joining Sora's team where he displays protective instincts toward younger characters like Melty and Benio, revealing a fiercely loyal dimension contrasting his usual self-effacement.