Rumi Usagiyama, the Pro Hero Mirko, wields her Rabbit Quirk to unleash formidable leg strength, speed, and agility, complemented by rabbit-like traits: long white ears, a fluffy tail, and piercing red eyes. Her heightened hearing and danger instincts proved vital in sensing threats like Tomura Shigaraki during critical missions. Born in Hiroshima, Rumi’s rebellious nature emerged early. As “Usako,” she infiltrated illegal fight clubs in middle school, facing repeated expulsions. Undeterred, she pursued underground combat arenas like the Underground Masquerade during high school, honing her solitary approach and disdain for teamwork. These experiences cemented her belief in self-reliance and physical dominance. As a Pro Hero, Mirko’s solo ethos propelled her to Japan’s No. 5 ranking, the highest for a female hero. The Paranormal Liberation War tested her limits: battling multiple High-End Nomu alone cost her left arm and right leg. She staunched wounds with her own hair, prioritizing the mission over survival. Post-war prosthetics, enhanced with modular weaponry, became extensions of her relentless combat style. Mirko’s signature lunar-themed kicks—Luna Arc, Luna Fall, Luna Tijeras—harness her explosive leg power to decimate foes. During the Final War, she confronted Shigaraki head-on, staggering him with her Luna Rush despite losing her right forearm. Brash yet pragmatic, Mirko challenges authority and respects blunt honesty, as seen in her rapport with Hawks. Though initially dismissive of teamwork, crisis forged alliances when necessary. Her philosophy—live without regrets—fuels high-risk gambits, sacrificing personal safety for societal good. Later years saw Mirko with shorter hair and advanced prosthetics, yet her ferocity endured. A symbol of tenacity, her solo triumphs and pivotal battle contributions cement her legacy as an unyielding force against overwhelming odds.