Cubism belongs to the Avant-Garders' leader and comes from the Team-Up Missions spin-off. The barest contact is enough to convert a person into a walking piece of three-dimensional cubist art, and nothing the victim does afterward will undo it.
Rendered in Japanese as Kyubizumu, this close-range ability debuts in Chapter 27 of Team-Up Missions in the hands of the villain heading the Avant-Garders. Its name is lifted straight from the avant-garde art movement of the same title, and it is catalogued among the Quirks original to that spin-off.
The conversion happens on contact and happens instantly. A deliberate grab is not required, since even a passing graze triggers it. Those caught retain the ability to move around in their reworked geometry, but no route back to their true form is available to them.
What ends the effect is not spelled out. Observation suggests the transformation lapses once the person casting it is pinned down and unable to act.

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Cubism is a close-range Quirk belonging to the leader of the Avant-Garders, introduced in the My Hero Academia: Team-Up Missions spin-off. On contact, it instantly reshapes a person into a walking piece of three-dimensional cubist art.
The leader of the villain group known as the Avant-Garders is the only known user of the Cubism quirk in My Hero Academia.
Cubism transforms anyone it touches into distorted, cubist style geometry. Victims can still move around in their reshaped form, but nothing lets them return to their true appearance on their own.
The Cubism quirk first appears in Chapter 27 of My Hero Academia: Team-Up Missions, used by the Avant-Garders' leader.
The exact end condition for Cubism is not clearly explained, though observation suggests the transformation lifts once the villain casting it is pinned down and unable to act.
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