Heal

Heal, written in Japanese as Iyashi, is a contact-range Emitter Quirk belonging to Chiyo Shuzenji, better known as Recovery Girl. It appears in Chapter 4 of the manga and Episode 4 of the anime.

Its name took a while to settle. The series has referred to the power as a "Super Healing Factor" and as "Healing" at different points, and the anime dub calls it "Recovery". The official name did not surface until the second databook.

The Quirk works by touch. Chiyo extends her lips, kisses the patient, and the body's natural recovery is amplified and sped up from there. She can also throttle the dose, choosing how much to mend so that she does not empty the person she is treating. Injuries that would normally demand months of rest can close entirely within seconds.

That speed is borrowed, not free. The healing draws on the recipient's own stamina, and anyone with serious wounds walks away exhausted. Should their reserves fall short of what the repairs require, the process can kill them, which is why life-threatening trauma has to be addressed with surgery and conventional medicine before the Quirk can safely finish the job. In those cases Chiyo often spreads the treatment across several sessions rather than attempting everything at once, and injuries severe enough will simply exceed what she can undo.

Certain damage resists it outright. Izuku Midoriya's right hand kept its scarring after he overtaxed One For All against Shoto Todoroki, and his arm was left permanently compromised after the 1,000,000% Delaware Detroit Smash despite Chiyo's intervention. Lost body parts never come back either, since the Quirk only quickens a process the body already performs and cannot manufacture what is gone.

Chiyo Shuzenji is the only known holder. She travels across Japan treating as many people as she can reach, and because she is a skilled surgeon in her own right, most injuries she encounters are within her power to handle personally.

At U.A. High School she runs the infirmary and its associated facilities, patching up students and staff alike. Without her, the school would struggle to defend the risk built into its exams and events.

Her relationship with Izuku Midoriya is more complicated than most. She knows exactly what his power does to him, and while she treats him readily for anything unrelated to his Quirk, she flatly refuses to repair the harm he inflicts on himself, using that refusal to discourage him from throwing One For All around recklessly.