Rabbit

Written as Usagi, Rabbit is the Mutant-type ability belonging to Rumi Usagiyama, better known as the Pro Hero Mirko. It debuted in Chapter 191 and reached the anime in Episode 90, and its effects operate at close range.

The Quirk rebuilds its holder around rabbit biology and everything that comes with it. Rumi gains long ears, a fluffy tail, and thick powerful legs, all functional rather than decorative, in much the same way Frog equips Tsuyu Asui with amphibian traits. Her hearing and sense of smell run well past human limits, sharp enough for her to place a distant fight precisely, and a prey animal's instinct warns her the moment danger closes in.

Everything offensive flows out of her legs. She travels by bounding and attacks by kicking or stomping, and one strike into the ground throws off wind pressure violent enough to blow out fire.

Mirko is the only known holder, and she has built a catalog of Ultimate Moves around the power, each named for the moon in a likely nod to Asian folklore about the Moon Rabbit. Luna Ring sends her cartwheeling through the air with legs extended to catch several enemies at once, while Luna Fall drops an overhead kick that plants a target in the ground beneath her. Luna Arc is a front-facing axe kick and Luna Rush a charging barrage of kicks. Luna Tijeras is the grisly one: she clamps her legs around an opponent's head, twists her whole body, and tears it free before smashing it down.