Welch

Welch was a teacher at Raxter School for Girls. Most details on her personal life are unknown. Welch is only five years older than the students and is the youngest of all the teachers. Before the Tox, she let students get away with more than she does now.

Welch cared very much about the Raxter girls and fought for them until the end. She chose to throw out contaminated supplies given to the girls in order to save them. When Camp Nash wanted to test on the entire student body, she refused to let them. Although, she eventually relented and sent Byatt and a few unknown others to the hospital for experimenting.

Welch is deceased. Her cause of death was a self-inflicted knife wound. During Hetty's final Boat Shift, Camp Nash sends a tank of gas instead of any usual food or supplies. This is presumably the same gas used on Byatt, and it is later released through the sprinklers at Raxter by Headmistress, killing several Raxter girls and harming others. Upon seeing this gas, Welch recognizes it. She breaks down, distressed that she can't protect the girls, and that "it's been over for a long, long time." Welch begs Carson to kill her, who refuses, but Welch takes Carson's hand and stabs herself.

Tox

 * "And a stain around her mouth, faint pink from the blood that’s always oozing out of her lips. Her and Welch-the Tox is different with them. It doesn’t cut them down the way it did the other teachers; it doesn’t change their bodies the way it does ours. Instead, it wakes weeping sores of their tongues, sets a tremor in their limbs that won’t go away.” Page 12-13"