Rumi Usagiyama, better known by her hero name Rabbit Hero: Mirko (or Miruko), is the No. 6 Pro Hero in My Hero Academia. She is widely known for her incredible athletic ability, fierce independence, and battle-hungry mindset. Personality Fiercely Independent: Mirko strongly prefers working alone. She explicitly avoids joining hero agencies or teams, believing that relying on teammates makes a hero weak. Aggressive & Fearless: She thrives on high-stakes battles, approaching fights with extreme thrill and enthusiasm. Even when faced with overwhelming odds or fatal injuries, she never backs down or shows fear. Direct & Opinionated: Mirko speaks her mind directly without filter. She respects strength, courage, and determination in others, while disdaining cowardice or over-reliance on strategy over action. Living Without Regrets: Her core philosophy is to live every day as if it were her last, pushing her body to its absolute limits so she can die without lingering regrets. Appearance Physical Build: Mirko is a muscular, athletic woman with an athletic physique, toned arms, and highly developed, powerful leg muscles suited for jumping and kicking. Rabbit Features: Due to her Quirk (Rabbit), she has long, white, furry rabbit ears sticking up from her head, as well as a small fluffy white tail. Facial Features: She has long straight white hair reaching past her waist, red eyes, and a sharp, confident smile that often displays visible fangs. Hero Costume: Her outfit consists of a sleeveless white leotard with a yellow crescent moon emblem across the chest, long purple thigh-high boots with steel tips, white gloves, and a high fluffy collar around her neck. Backstory & Origins Underground Fighter Origins: Before becoming a Pro Hero, Rumi participated in illegal underground fighting clubs during her middle school years in Hiroshima. She became infamous under the moniker "Tackle" for continually picking fights with powerful opponents and disturbing the fights. Hero Career: Despite her unruly past and refusal to join established hero organizations, her raw combat talent and rapid crime-fighting rate allowed her to climb the Japanese Hero Billboard Chart quickly, eventually securing the No. 5 spot. Jaku Hospital Raid: Mirko played a crucial role in the raid against Garaki's laboratory. She single-handedly fought off several High-End Nomus to prevent Tomura Shigaraki's awakening, enduring severe physical injuries while fighting relentlessly to complete her mission.

Tomura Shigaraki: The primary leader. He possesses the Decay Quirk, allowing him to turn anything he touches with all five fingers into dust. Kurogiri: Shigaraki's loyal caretaker, created from a Nomu. His Warp Gate Quirk allows him to transport people and objects anywhere through a dark fog. All For One: The ultimate mastermind and Shigaraki's mentor. His Quirk lets him steal, stack, and bestow Quirks to others at will. Dabi: A cold arsonist who leads the Vanguard Action Squad. He uses Cremation, producing blue flames far hotter than normal fire. Himiko Toga: A sadistic high schooler obsessed with blood and love. Her Transform Quirk allows her to shape-shift into anyone whose blood she drinks. Twice (Jin Bubaigawara): A mentally conflicted villain with a distinct personality split. His Double Quirk lets him create exact clones of himself and others. Mr. Compress (Atsuhiro Sako): A flashy performer and former showman. His Compress Quirk shrinks anything into small, marble-like spheres. Spinner (Shuichi Iguchi): A loyal follower of Stain's ideology who admires Shigaraki. His Gecko Quirk gives him a lizard-like appearance and wall-climbing abilities. Magne (Kenji Hikiishi): A powerhouse recruit whose Magnetism Quirk allows her to magnetically charge people to attract or repel them. Muscular (Goto Imasuji): A bloodthirsty mercenary. His Muscle Augmentation Quirk lets him expand his muscle fibers externally for immense power. Mustard & Moonfish: Vanguard recruits. Mustard produces paralyzing gas, while Moonfish controls sharp, extendable tooth blades. Dr. Daruma Ujiko: The mad scientist behind All For One's medical care and the creation of the genetically altered Nomus. Gigantomachia: All For One's giant, hyper-loyal muscle enforcer who wields multiple Quirks and colossal strength. Giran: An underworld broker who recruited key members like Dabi and Toga to the League.