Rumi Usagiyama (兎うさぎ山やまルミ, Usagiyama Rumi?), also known as Rabbit Hero: Mirko (ラビットヒーロー ミルコ, Rabitto Hīrō Miruko?) | Rumi is tough and always speaks her mind, even if it causes confrontation, and she respects those who do the same. As a hero, she proves to be very fearless and independent, freely traversing Japan while bravely facing any villain she comes across.