User:QueeneriHEHE

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.The little girl accidentally killed her own father and got abandoned by her mother. After getting abandoned, a villain called overhaul abused her power and traumatized his granddaughter. I wears bandages because Overhaul keeps destroying her arms to get my blood. The horrifying child abuse alone is enough to go save Eri. ... Saving Eri isn't only about stopping child abuse. It's about stopping the production of Quirk-erasing drugs to save the lives of potentially millions of people.

Why is Shigaraki so crusty?

The reason that his face is crusty is because of the affects that his quirk has on his body. The pigmentation of his hair is decaying due to his quirk so that's why it went from black to blue. Also it has affects on his skin as well.