Yuki Rurikawa, a 15-year-old actor and costume designer for the Summer Troupe, captivates with his feminine charm and whimsical self-crafted outfits. Though male, his modern bob-cut green hair, orange eyes, and penchant for frilled blouses, skirts, and a bear-shaped bag often lead to mistaken identity. His blunt demeanor and sharp wit fuel candid critiques, particularly toward seniors—a defense mechanism stemming from childhood bullying over his fashion choices. Raised in a household encouraging self-expression, his parents granted him creative freedom, though his mother later sought to temper his boldness. Initially joining the theater to study his costumes onstage, he unearthed a passion for acting, evolving into a dual role as performer and lead designer. With self-taught sewing expertise, he crafts costumes for all troupes while assisting with hairstyling and makeup.

Yuki’s relationships blend friction and camaraderie. He shares a stormy dynamic with troupe leader Tenma Sumeragi, his roommate, clashing over egos and clutter while harboring unspoken mutual respect. He maintains a supportive bond with schoolmate Muku Sakisaka, who admires his tenacity, and tolerates Kazunari Miyoshi’s exuberance, begrudgingly valuing their creative synergy. Though perplexed by Misumi Ikaruga’s quirks, he respects his enthusiasm for costume artistry. Famously dubbing peers with nicknames—from affectionate “Azu-nee” for Azuma Yukishiro to cutting “Hack” for Tenma—he voices raw perceptions without malice. Past bullying bred a protective sharpness, yet subtle growth emerges as he encourages Muku’s confidence and collaborates on projects.

Leveraging androgyny, Yuki excels in female roles like Scheherazade in *Water Me!* and Shiro in *The Great Sardine Search*. His immersive preparation includes studying ghost stories to embody Scheherazade—a tactic that accidentally exposed Tenma’s horror phobia. Offstage, he experiments with traditional kimonos, merging vintage elegance with modern flair. Childhood piano lessons, a rumored crush from Taichi Nanao, and a bear doodle mirroring his iconic bag hint at hidden layers. His surname (“lapis lazuli river”) and given name (“happiness”) reflect the duality of his spiky exterior and underlying warmth.