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. Eri is a small girl with bluish, off-pale blue hair, messy and unkempt, which is parted in the middle of her forehead, almost reaching down to her waist. She is 7 years old. Her birthday is December 7.