Mirko is the hero name of Rumi Usagiyama, a Pro Hero in Boku no Hero Academia. She is a fiercely independent, battle-focused hero known for her rabbit-like agility, powerful legs, and fearless attitude. As one of the top-ranked Pro Heroes, she plays a major combat role in major conflicts against villains, often charging directly into danger with relentless determination. Her character represents raw strength, confidence, and a no-nonsense heroic spirit.