Chiyuki Kuwayama, a 23-year-old idol, balances her poised, nurturing demeanor with a steadfast commitment to her roots. Recognized as the "big sister" of her group, her brunette braid tied with a ribbon, warm amber eyes, and serene expression radiate maternal calm. She crafts stuffed animals and accessories, a skill refined during her high school art club days and part-time work at a general store—a job she continues alongside idol duties to stay grounded. Though gentle and supportive, she habitually conceals stress to uphold her role, a duality her unit members perceive as more motherly than sisterly.

Her creations often appear in shared spaces, like the producer’s desk, testament to her quiet thoughtfulness. Within ALSTROEMERIA, she shares a familial bond with twins Tenka and Amana Osaki, guiding them while grappling with her own insecurities. Beyond performances, she connects casually with colleagues, such as sharing drinks with the office secretary, revealing a relatable side beneath her professional grace.

Nicknamed "bull-eyes Chiyuki" for her uncanny shooting game precision, she approaches leisure and work with equal meticulousness, reflected in her consistent choice of outfits across events. Her journey intertwines personal growth with an unwavering dedication to reliability and creativity, anchoring her identity as both an idol and a craftsman of subtle warmth.