Who Is Eri Mha?

Eri ( 壊 え 理 り , Eri^?) is the granddaughter of the Shie Hassaikai

's boss. She was also the key source of Kai Chisaki's operation to manufacture a Quirk-Destroying Drug. She has been living at the U.A. dormitories since she was rescued.

What is Eri quirk?

Quirk. Rewind: Eri's Quirk allows her to rewind the state of a living being, this includes her reverting a person's age and, as shown with her father, being able to rewind a person out of existence. ... Due to her young age, Eri has no control over her Quirk and fears it harming others.

What happens to Eri in MHA?

She's the former Hassaikai boss' granddaughter, and a flashback reveals that she was abandoned by her mother after her quirk went out of control. Saying that Eri was cursed and caused the death of her husband, Eri was left in her grandfather's care.