Eri

is the granddaughter of the Shie Hassaikai's boss. She was also the key source of Kai Chisaki's operation to manufacture the Quirk-Destroying Drug. She has been living at the U.A. dormitories since she was rescued.
==Appearance==
Eri is a small girl with bluish, off-white hair, messy and unkempt, which is parted in the middle of her forehead, almost reaching down to her waist. She has very wide, innocent-looking eyes, which are bright red in color. Poking out from the right side of her forehead is a small, brown horn, which grows larger when her Quirk is activated.
In her first appearance, she's wearing a plain, short-sleeved dress, which is a dirty, pale tan color. Bandages are wrapped around both her arms and legs, stopping at her wrists and ankles, underneath which she is shown to have numerous scars.
After she's taken in by U.A., Eri's outfit is changed to a white dress shirt with a frilled collar and a plain red pinafore with two large, golden buttons on either side of her chest. Under this, she wears gray tights and a large set of tan boots, and a small dark red messenger bag with the strap sitting over her right shoulder, and a little floral pattern decorating one of its sides. Her hair also looks to be better cared for, appearing straighter and neater than it was during her time with the Shie Hassaikai.
===Gallery===
Eri Full Body Profile.png|Eri's full updated appearance in the manga.
Eri as a child.png|Eri as a toddler.
==Personality==
Because her mother disowned her after she accidentally made her father disappear with her Quirk and the experiments she was subjected to by Kai Chisaki, Eri became a fearful and secluded girl, without anyone showing affection to her in her life. Apparently, Izuku Midoriya's touch was the first time she ever felt kindness, which overwhelmed Eri and brought tears to her eyes. When murderous intentions are directed towards her, she neither screams nor cries but simply remains silent in knowing that she has no choice but to accept whatever will happen to her. Although Eri's attempts at resisting and escaping her abuse slowly diminished, she still made numerous attempts to escape her captors, despite knowing nobody she could turn to.
Eri is, however, willing to let herself go with Kai in order to protect those who help her, as she feels guilt over other people getting hurt in order to rescue her. This is a result of Kai manipulating Eri into believing that her existence and Quirk are only meant to harm others. As such, Eri feels strong and horrible guilt and does not want other people to die because of her.
Unfortunately, after her rescue, Eri still psychologically suffered from Kai's influence, as she was unable to smile due to having no experience of being happy. However, this changed, thanks to the events of the U.A. School Festival, where Eri finally smiled for the first time and expressed her joy at Class 1-A's band performance. Following this event, Eri becomes more cheerful around those she is familiar with and slowly accustoms to her new life at U.A.
At first, Eri still felt negative about her Quirk and was apologetic to her caregivers at U.A. when believing that it was causing them trouble. After Izuku encouraged her that Rewind could also be used for good, however, Eri develops a more positive outlook both in general and in regards to her power. This improvement is later shown when she is able to restore Mirio's Permeation, telling the latter not to be sorry, and that she had been training Rewind to bring his power back as a means of thanking him while tearing up in happiness.
Due to her previous upbringing and isolation, Eri is still rather unfamiliar with many regular concepts and day-to-day things. This includes holidays, as she mixed up Halloween, Setsubun and Easter with Christmas.
==Abilities==
Overall Abilities: Despite her powerful Quirk, Eri is very inexperienced due to her young age and previous isolation, especially after being subjected through various experiments by Overhaul throughout her childhood, having never been educated about her Quirk and not knowing how to use or control it. During the Shie Hassaikai Raid, Eri begins to grasp the abilities of Rewind when she split Overhaul and Shin Nemoto apart. Later, during Izuku's fight with Overhaul, she had accumulated enough energy to allow Izuku to reach Full Cowl - 100%, but wasn't able to control her power output as she continued to rewind Izuku before the timely arrival of Shota Aizawa, who used Erasure to prevent her Quirk from killing Izuku. Afterwards, Eri gained a fever and fell unconscious.
After being rescued by Izuku and Mirio Togata, and moving into U.A. High School, the faculty have helped Eri train her power. Using small ounces of energy, she managed to regenerate the limbs of bugs and lizards. Eventually, she gained enough control over Rewind to restore Mirio's Permeation Quirk the day before the Paranormal Liberation War began.
===Quirk===
: Eri's Quirk allows her to reverse a living body back to a previous state, allowing her to make her target physically younger, heal injuries, and undo bodily modifications. As shown by the childhood incident of accidentally using her newly emerged Quirk on her father, she has even rewind someone's body to a point before they existed, erasing them completely.
The source of her Quirk's power is located in the horn on her head, and the size of the horn dictates the strength of her power. As Neito Monoma revealed when he copied her Quirk, It is also an accumulation-type Quirk, which means the power it emits has to build up over a period of time before becoming usable.
As a result of her Quirk mutating her body, Eri's blood is able to attack an individual's Quirk and stop its activation by reversing the target's evolution before the point of the Quirk phenomenon, a fact that became the crux of Kai Chisaki's ambitions as he supplied the creation of the Quirk-Destroying Drug by using his own Quirk to viscerally deconstruct her, gather quantities of her blood, and then quickly reconstruct her.
It was suggested by Eraser Head that her Quirk can even rewind the bodies of those who have lost their Quirks and restore them. However, Eraser Head indicated that Rewind only works on people, not on things, which means that it's not something that can be easily trained. This also means Eri cannot use her Quirk on an immaterial concept like time, as it is not a living thing.
==Battles & Events==
==Chapter Appearances==
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==Anime Appearances==
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==Trivia==
*Eri's name is composed of two characters: and .
**Putting the two characters together can translate as "destruction", noting how her Quirk was used to make Quirk-Destroying Drugs and how it can potentially destroy living things by rewinding them out of existence. Her name also alludes to how her Quirk "breaks logic" by its very nature, being referred to as a mutation since it does not resemble any Quirk from either side of her family and very few people understand how it works.
*Eri's favorite fruit are apples.
**Eri shares her liking of apples with Fumikage Tokoyami and Pony Tsunotori.
*Eri's English voice actress, Emily Neves, also voices Sirius.
*Eri has many similarities with Tomura Shigaraki as a child:
**Both of them have light blue/white hair and red eyes.
**Both children manifested unique and dangerous Quirks that ended up killing their relatives, Eri's father and Tomura's entire family.
**Both had caring grandparents and conversely, Eri's maternal grandfather was a Yakuza boss while Tomura's paternal grandmother was a Pro Hero.
**Both children were abused, Eri by her foster father, Kai, and Tomura by his actual father, Kotaro Shimura.
**Both Eri and Tomura were taken in by villains, Overhaul and All For One respectively. The only difference is that Eri was subjected to torture at the hands of Overhaul and was eventually rescued by a hero while All For One treated Tomura with care, albeit for his own motives, and raised him to become a murderous villain himself.
**Additionally, both Overhaul and All For One are responsible for getting rid of their grandparents with Overhaul having forced Eri's grandfather into a coma while All For One killed Tomura's grandmother in battle.
==References==
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