Hitoshi's Quirk allows Hitoshi to assume control of anyone who answers one of his questions, forcing them to do as he says.
The Quirk is willingly activated by Hitoshi, who otherwise can hold normal conversations with other people without having to brainwash them. It is shown that he can control more than one person at once.
As long as the foe remains silent, this Quirk will not have any effect on them. It is also possible to escape the mind control if the victim is hit by a sufficiently strong physical jolt or through a similar amount of pain. Brainwashing is implied to not work on non-living entities, which can justify Hitoshi's failure in the U.A. Entrance Exam (as the targets in the practical portion of the exam were robots).
- Brainwashing - Wikipedia article about the concept Hitoshi's Quirk revolves around.