Wearable kinetic energy. Steampunk style. Infinite power.
A wearable kinetic energy generator disguised as a steampunk/cyberpunk yoyo. Cosplayers spin to power real-time LED lighting and effects in their costumes. No more heavy battery packs—just your movement powering the show.
A cosplayer in a 30-pound Iron Man costume spins the Yaya for 60 seconds. Suddenly, the entire arc reactor flares up, the helmet eyes blaze, and the palm repulsors burst to life with pulsing light—no battery pack, just their own motion powering the show. Convention-goers stop and stare.