OS Idol Win-chan - Akuma ver. is a bold, compact mascot-style figure designed to capture the clash between cuteness and a hint of demonic charm. The character stands in a dynamic pose with one leg forward, head tilted, a playful wink, and a mischievous smile. Her hair is styled in twin-tails with gradient shading from bright pink to deep crimson, streaked with glossy black to echo her Akuma alter ego. She wears a stylized idol outfit: a short frilly dress with flame motifs along the hem, black gloves, and knee-high boots, accented by red ribbon bows and tiny flame decals. Across her shoulders rests a small cape or wing-like accessory that hints at wings, and two curved horns peek from her head, painted in metallic gold with red tips. The figure's surface finishes mix matte skin tones with glossy hair and metallic accents, delivering a lively, collectible presence. Subtle sculpted details emphasize the character's energetic pose and confident expression, making it feel ready to perform a digital concert.

Win-chan began as a mascot designed to symbolize the fusion of technology and entertainment in the Mascot Character series. In her Akuma ver. incarnation, she channels a playful demon guardian who thrives on dramatic stage entrances and crowd energy. In the stories, Win-chan uses a hidden power called the Overclocked Spirit to boost cheers into sparkling music that resonates with fans across virtual arenas. She travels between digital cities, collecting fan chants as coins of power, challenging rival mascots in friendly dance battles, and always delivering a message of resilience and optimism. The Akuma design adds a bold edge to her character, representing passion and fearless pursuit of dreams, while her pure-hearted idol persona continues to guide younger fans toward creativity and collaboration. Across each performance, she remains true to her mascot roots, balancing mischievous charm with a dedication to making every concert a moment of shared joy.