Shirasaka Koume is rendered in a vivid stage pose that captures her bright, buoyant idol energy. The figure stands with one foot forward, her head slightly tilted in a friendly, confident smile. She wears a pastel stage costume that blends soft pink with white and gold accents, featuring a bodice with delicate frills, a short layered skirt, and decorative ribbons that seem to swing with her movement. Glossy paint highlights are used on the hair, eyes, and accessories to emphasize Koume's lively expression. Her hair is styled with cheerful twin tails and sparkling hairpins that catch the light. The sculpting enhances the dynamic flow of the fabric and the pose, while a lightweight stand or star-shaped base provides stability without drawing attention away from the figure. The overall presentation conveys a playful, hopeful idol who loves to perform.

Shirasaka Koume is introduced in THE iDOLM@STER Cinderella Girls as a hopeful young idol who pursues her dream with warmth and perseverance. She is known for a friendly, down-to-earth demeanor, a steady work ethic, and an ability to lift others with her smile during long training days. In the series, Koume faces auditions, rehearsal challenges, and fan encounters as she grows from a rookie performer into a confident idol who can light up a stage. Her journey emphasizes the importance of practice, teamwork, and optimism, showing how small improvements accumulate into a memorable performance. Offstage, she values friendships with fellow idols and supportive mentors, drawing strength from those bonds. The character’s arc celebrates resilience, dedication, and the joy of sharing music with fans, themes that this figure aims to honor in pose and design.