Mimicry

Mimicry, rendered as Mimic in the English dub, is a close-range Emitter Quirk used by Joi Irinaka. It debuts in Chapter 132 and reaches the anime in Episode 68.

The owner relocates his physical form and his consciousness into a solid object, then moves and reshapes it as freely as he would his own limbs.

Size normally caps out at roughly an average refrigerator. A boost, presumably from the drug Trigger, let Joi work a whole location at once. Occupying an object also costs him awareness. He cannot take in his surroundings properly from inside, so he has to push a body part out through the surface to watch events or handle anything with precision, and that exposed piece hands enemies something to attack.

Joi Irinaka is the only known holder. Day to day he lives inside a small black cloak, using it to travel and to deal with others, extending individual limbs whenever the situation calls for it.

Under Trigger he took hold of the ground beneath the Shie Hassaikai base and stalled Sir Nighteye's raid team, twisting corridors, throwing up walls, dropping people into sealed rooms, and launching attacks the whole time. Buried in the concrete, he sat beyond the reach of Shota Aizawa's Erasure. Himiko Toga and Jin Bubaigawara eventually worked his temper against him, goading him into a reckless gamble that exposed his position and cost him the fight.

The power resembles Shihai Kuroiro's Black in broad strokes, with clear differences. Black only works on objects of a particular color but carries no size restriction, while Mimicry is the reverse. Shihai also needed to develop his Quirk before he could move what he possessed, and even then he remains limited to mobile objects, whereas Joi could reshape a host however he liked.