Description
Seira Otoshiro is a pink-haired idol affiliated with Dream Academy, recognized for her cool-type persona and primary association with the rock-inspired brand Swing Rock. She features waist-length pink hair typically tied in a ponytail with a purple ribbon and possesses orange eyes.

Initially trained in classical instruments, she shifted focus to rock music after discovering the guitar, performing in a rock band before pursuing idolhood. Her motivation stemmed from witnessing Soleil's performance, which demonstrated how idols could evoke audience smiles; this inspired her application to Starlight Academy. However, she was rejected as evaluators deemed her more suited to rock singing than idol work. Subsequently, encountering Dream Academy in a magazine, she demanded an audition at its gates and was accepted by Tiara Yumesaki, who recognized her musical passion. Her core dream involves creating music that brings joy to listeners and fulfills her younger sister, Noeru Otoshiro. Her family operates Cafe Vivo.

Personality-wise, Seira projects rock-inspired boldness and leadership, yet harbors innate shyness and humility. She gradually learns to embrace her multifaceted nature, including her adoration for cats, understanding fans value authenticity over a curated image. She employs the informal pronoun "atashi" and uses competitive yet playful catchphrases like "If you're 'do' then I'm 're'. If you're 're' then I'm 'mi'. I'll always be a step ahead of you!", along with trademarks "La la la!" and "An uncountable number of dreams awaits just around the corner!". Her talents encompass perfect pitch and proficiency in multiple instruments.

Her relationships include Kī Saegusa, her best friend and producer, whom she encouraged to pursue idol auditions. She forms the unit 2wingS with Ichigo Hoshimiya, evolving from rivals to partners; they placed second in the Partner's Cup but later triumphed in the Twinkle Star Cup, sharing a dynamic of mutual encouragement and lighthearted rivalry. Tiara Yumesaki serves as her mentor, having facilitated her Dream Academy enrollment.

She appears in "Aikatsu on Parade!" as part of Dream Academy. Trivia notes include her height of 158 cm, birthday on November 11 (aligning with Japan's Pocky Day), Scorpio zodiac sign, blood type A, and favorite foods of baked cheesecake and pickled vegetables. She holds two Premium Rare dresses. Her surname "Otoshiro" combines "Oto" (sound) and "Shiro" (castle), referencing her musicality, while "Seira" signifies "holy" or "good."