All For One (Quirk)

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

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

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.

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 Tomoko Shiretoko whose Search Quirk was stolen. Furthermore, 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.

Sometimes, a Quirk granted by this ability can blend together with the original Quirk of the target, creating an entirely new one, as shown with One For All.

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.
 * All for One is the oldest known quirk in the series, as a quirk that first appeared generations ago during the early days of quirks and persisted to the present day in the same user as said user obtained an extended lifespan with a stolen quirk. The next oldest known quirk to have persisted from that period, One for All, was created by All for One.