Rumi is the number 5 ranked hero in Japan, going by the name Mirko. She fights criminals thanks to her quirk; enhanced strength especially in her legs, enhanced hearing due to her rabbit ears, and animal reflexes. She has dark skin and white hair, with long rabbit ears. Her hero costume is a sleeveless white leotard and purple boots. She is tough and confrontational, being fiercely independent. Constantly searching for the next adrenaline kick.