Eri

Eri is the key source to Kai Chisaki's operation to manufacture a Quirk-Destroying Drug. She is the granddaughter of the Eight Precepts of Death's boss.

Appearance
Eri is a child with bandages all over her body. She wears a white short sleeve dress and has a small horn on the right side of her forehead and has white, long, choppy, unkempt hair. She also has red eyes.

Personality
Eri is a frightened and innocent little girl who does not want to take part in Chisaki's plans. Because of this, Chisaki considers her a "troublemaker".

Her relationship with Chisaki and the Eight Precepts suggest that she has never felt affection in her life. As she has claimed up until now, Izuku's touch was the first time she felt kindness, which overwhelmed her. When murderous intents are directed at her, she does not scream, nor cry and simply remains silent, because instead of bracing for the pain, she knows she has no choice but to accept.

Eri is, however, willing to let herself go with Chisaki in order to protect those that help her.

History
Eri is the granddaughter of the ex-Capo of Criminal Yakuza, the Eight Precepts of Death. At a young age, she accidentally used her newly manifested Quirk on her father and it caused him to vanish. Her Quirk resembled neither of her parents' so her mother believed her existence to be cursed and gave the girl up to her father. Her grandfather then left her in the care of his protege, Kai Chisaki, so that he could test her to identify her Quirk as well be able to sympathize as it seemed as if they had similar Quirks. However, her Quirk was misdiagnosed and was in fact 'Rewind' and not 'Vanish'.

After her grandfather fell into a critical state of illness, Kai took over the organization and then began to experiment on Eri to turn her Quirk into a weapon. Through unknown means, he discovered that her blood had properties that suppress the bodies' ability to manifest 'Quirk Factor', inhibiting someone's Quirk. He manufactured them into bullets that be shot at a target and inject them with her blood. He did this by destroying Eri with his Quirk, collecting blood, and then repairing her. He did this hundreds upon thousands of times, despite Eri's pain. Eri tried to escape and resist many times but to no avail and eventually accepted her fate as a prisoner. However, the effect of these bullets was temporary, and Kai used further tests to be able to perfect his experiment until he had refined the process enough to create bullets that he believed could permanently destroy Quirks.

Internship Arc
Eri was running down an alley away from Kai, mentally chanting she had enough of her treatment and wishing someone would save her. She bumps into Izuku Midoriya and Mirio Togata, and Kai catches up to them.

Remedial Course Arc
A couple of days after her hospitalization, Eri wakes up albeit still in a psychologically unstable state. Her horn, where her Quirk came from, had noticeably shrunk to the size of a lump.

Quirk and Abilities
Rewind: Eri's Quirk allows her to rewind an individual's body to a previous state. Eri is able to reverse the fusion of Kai Chisaki and Shin Nemoto. She has shown the ability to rewind someone's body to a point before they existed, which she accidentally did to her father. Since she can rewind a person's body to a previous state, she is able to undo the damage Izuku does to his own body when he uses One for All at 100%. While Izuku is in physical contact with Eri, he is able to keep One for All continually activated at 100% with no ill effects.

As a result of her Quirk mutating her body, Eri's blood is able to attack an individual's Quirk and stop its activation. This ability within her DNA makes Eri an important part to Chisaki's plans. Supposedly, he is using her blood to stop the activation of Quirks in order to control society through fear (similar to how All For One controlled people by taking away their Quirks) and using that as a means of destroying justice.

It was revealed that the source of her quirk's power is located on the horn on her head and the size of the horn dictates the strength of her power.

Kai Chisaki
Eri is terrified of him. Similar to how he treats his members, Chisaki only values Eri for her use. Because of his Quirk, Chisaki does not hesitate to endanger her life, as he can simply fix her if he acts soon enough. This has had a profound effect on her, causing her not to cry or scream when threatened or in pain, but to simply grin and bear it, as she has been taught she can do nothing else.

Izuku Midoriya
Izuku Midoriya is the first person to ever touch Eri with kindness. When she tries to escape from the Eight Precepts, he refuses to turn her over to Chisaki, forcing her to run back to him when she thought Chisaki would kill Izuku and Mirio Togata.

During rescuing of her, Izuku is the first person not to call her Quirk a curse but rather kind and gentle, driving Eri to tears of joy.

Mirio Togata
She first meets Mirio at the same time she meets Izuku, although they does not react well. When Mirio finds out about what was happening to Eri, he blames himself greatly and becomes determined to save her. He is the first person to give her hope that she could be free of Chisaki and the Eight Precepts.

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Eri