Rumi Usagiyama, hero name Mirko, holds the rank of Japan’s fifth-highest Pro Hero. Her "Rabbit" Quirk grants explosive leg strength, enabling devastating kicks and gravity-defying leaps. Mirko’s striking features include waist-length white hair, crimson eyes, and tall rabbit ears framing her tanned, athletic build. Her combat-ready costume pairs a sleek white leotard with a plush collar, dark purple thigh-high boots armored with metal plating, and fingerless gloves edged with frayed cuffs. Blunt and uncompromising, Mirko voices her opinions with fearless candor, prioritizing raw honesty above diplomacy. She admires those who match her directness. A thrill-seeker at heart, she charges into battle with unshakable confidence, her trademark grin widening as danger escalates. Independence defines her approach; she confronts villains head-on, relying on instinct and brute force to dismantle threats. While her origins and training remain undisclosed, Mirko’s relentless climb to the hero ranks highlights a lifetime of discipline. She actively patrols chaotic zones, intercepting crises with ruthless efficiency. Her reputation rests equally on combat mastery, arresting visuals, and an unwavering resolve to protect civilians, embodying heroism through action over words.