Eri does manage to restore his Quirk My Hero Academia fans breathed a sigh of relief when Mirio Togata finally restored his Quirk. Right before the Paranormal Liberation War, Eri was able to use her Rewind Quirk to restore Mirio back to his old self.
After settling in at U.A. High School, Eri began training her Quirk by using it to restore the limbs of bugs and lizards. Through these months of training, Eri managed to obtain enough control over Rewind to restore Mirio's Quirk, Permeation.
Mirio was able to get his Quirk back in time
Eri succeeded in reverting Mirio's body to a state before he lost his Permeation Quirk. With the ability to phase himself through solid objects, Mirio was able to make a surprise appearance in My Hero Academia Season 6.
Eri has demonstrated the ability to rewind a person back to their prime state. She was responsible for restoring Mirio Togata's Quirk in the Paranormal Liberation War. However, this required extensive training since Eri could accidentally erase someone from existence.
Following a scorching defeat at Endeavor's hands, All For One used an unstable version of Eri's Rewind Quirk to revert himself back to prime fighting condition. This drastic measure was irreversible, meaning that All For One would slowly rewind himself into nothingness.
However, in her true nature, Eri holds a murderously hatred towards Shizuku for being Kouki's childhood friend (although she is Hajime's lover) as she wanted to kill her and the rest of their classmates to claim Kouki for herself. She considered Shizuku as one of her mortal enemies (along with Kaori).
This is shown to be the case with Deku's Black Whip quirk and would theoretically apply to any other powers All For One has stolen and transferred to other people throughout his evil dealings.
To prevent a Quirk-erasing bullet from taking root in his body and stealing his Quirk, Aizawa unflinchingly saws off his own leg.
Eri's quirk is Rewind, meaning that she can rewind the state of any living thing. This means that she can make someone younger, force them to disappear completely, heal their injuries, or even get rid of their Quirk.
Weaknesses: She has no control over her own Quirk and thus can harm others around her even if they are her allies. She is extremely traumatized by her experiences as Overhaul's prisoner, which can be used to manipulate her.
Theoretically, yes. She should very well be able to heal from almost any injury. decapitation is tricky though.
As Eraserhead says when he's escorting Deku to Nighteye's room, Eri's Quirk is not under control and is likely to destroy someone rather than heal them, which is why he says "We cannot depend on her Quirk" - specifically, they can't make use of it to save Nighteye.
Katsuki Bakugo (Japanese: 爆豪 勝己, Hepburn: Bakugō Katsuki), also known by his nickname Kacchan (かっちゃん, Katchan) and his hero name Great Explosion Murder God Dynamight (大・爆・殺・神ダイナマイト, Daibaku Kisshin Dainamaito), is a superhero and one of the main protagonists of the manga series My Hero Academia, created by Kōhei ...
With her newly controlled abilities, Eri could significantly tilt the battle in the heroes' favor (and save Shigaraki in the process) by simply rewinding the villain back to a time when he was still "Tenko Shimura" – possibly before his horrific quirk power ever kicked in and made his life one of gruesome death and ...
All For One is, quite possibly, the strongest Quirk there is in My Hero Academia. It was formerly wielded by All For One and is currently in Shigaraki Tomura's possession.
Yes, she can. In the recent manga, Eri was able to rewind Mirio's genetic structure so that he could get his powers back. Eri has also been shown rewinding broken bones and other injuries with ease. I'm guessing you're asking this because Aizawa recently lost his leg.
Mirio Togata
He is the first person to give her hope that she could be free of Kai and the Shie Hassaikai. He later invites her to the school festival and holds her in the air for her to see Izuku perform. Since then, the two have become closer, with Mirio becoming an older brother figure for Eri.
Eri's Quirk rewinds a person to a previous state. So, she can theoretically reverse aging. If her power can be applied to herself (this is fairly inconsistent among emitter quirks so it's up for debate), this means she can keep herself young forever.
Deku initially introduced himself by his real name, Midoriya Izuku, but then he insisted on being called by his Hero name. He felt as though Deku would be easier to remember. As a result, Eri regularly refers to Deku by his Hero name rather than his civilian name.
Blackwhip was the first Quirk within the One For All that Deku awakened. Due to this Quirk's ability to produce webs of energy that can be used as ropes, this Quirk is quite useful. In combat, it can also be combined with other Quirks and is thus one of the best abilities that Deku possesses.
Joke to the stage, and Fukukado Emi has a big crush on Aizawa.
Hikage Shinomori
The fourth user of One For All. His original Quirk was Danger Sense, allowing the user to sense danger at the expense of causing them pain. Hikage inherited One For All at the age of 22.
The man that would be known as Nine was born with a Quirk that allowed him to control and manipulate the weather around him. His Quirk was immensely powerful and was viewed as a god-like ability. At the same time though, Nine was one of the many who felt outcasted in society and believed that it should not be this way.
All For One is arguably the rarest and most powerful Quirk possessed by any villain in My Hero Academia. This Quirk so thoroughly defines its bearer that he's taken it as his name. All For One's Quirk lets him steal Quirks from other people and use them as though they were his own.
One For All offers immense durability, and a variety of other useful abilities, but none of them are as overpowered as Overhaul. With this Quirk, all Kai has to do is touch the current wielder, and their body will be blown apart instantly, and One For All will be destroyed as well.