Show By Rock!! Mashima Himeko is rendered in a dynamic pose with one foot stepped forward, standing on a music-note themed base. The sculpt captures her chic stage outfit with layered details, a frilled skirt, and a fitted bodice accented by ribbons and metallic trim. Her hair is sculpted in clean, slightly tousled strands that frame a determined, glossy-eyed expression. The paintwork emphasizes a vivid color palette typical of the series, with bright pinks, purples, and teal highlights, including subtle shading in folds, highlights on the boots, and precise line work on the instrument and accessories. A miniature microphone stand and compact instrument are included, both rendered with careful proportions to convey movement and performance energy.

Mashima Himeko is a talented guitarist in Show By Rock!! who balances school life with a rising music career. Born in a small town, she discovered her voice and found confidence through melody. Her songs weave hopeful messages and rebellious energy, drawing fans from across the city. In the story, she teams up with other musical stars to defend their virtual stage against a looming digital shadow that seeks to steal people's memories of music. Her perseverance and teamwork highlight themes of friendship and self-belief.