All For One (Quirk)

All For One (オール・フォー・ワン) is a Quirk used by Sensei.

Quirk Description
All For One allows the user to steal other people's Quirks and render these stolen powers as their own. All For One also allows the user to transfer the Quirks they stole to other people.

After the user of All For One steals a Quirk, the person whose Quirk was stolen becomes unresponsive and descends into a comatose-like state, as seen with Ragdoll whose Search Quirk was stolen by All For One, which caused her to enter a comatose-like state.

Not all recipients of a Quirk from All For One are able to handle the strain of gaining them. Subsequently, they become mindless dolls who are not able to speak or think for themselves.

When a Quirk gets transferred to someone who already has one, a mutation may occur and the two Quirks may blend together, creating an entirely new one, as shown with One For All.

It is implied that All For One can multiply the strength of Quirks, thus making the Quirk more powerful or boosts the Quirk's effect depending on the nature of the Quirk, as shown when All For One multiplied his Muscle Enhancement by three times.

The user of All For One can combine several Quirks in order to create devastating techniques which would normally not be possible with the usage of only one Quirk.

Trivia

 * All for One, together with its counterpart, One for All, may be derived from the popular motto of the titular heroes of the novel The Three Musketeers by Alexandre Dumas.
 * One For All's name is an inversion of All For One, showing the differing philosophies between their wielders. The former emphasizes one using their power for the betterment of others while the latter is meant to selfishly hoard power for one's own sake.