Born as one of the many nuns in the monastery of Septent. Susan was often tasked with guiding the other nuns and trains them, some of these include Olivia, Kathleen, Allison and Marilyn. From time to time she has also guided Leah, but was jealous that she had become the favorite of Waxy. Despite that she has a good relationship with Leah, but also spies on her performing experiments which gave Leah motivation to flee from the monastery. Afterwards Susan took up the experiments and started going insane.
Being a total devout, Susan follows the Bible's rules on every step and greatly looks up to her mother superior, Waxy. Despite that Susan continues to sin, although she denies them being sins. Envy taking a front seat with Susan, being jealous of Leah's relation with Waxy and her skills in medicine. While she first shows signs of insanity, once Susan continues Leah's work inside of the monastery she begins to loose it, being cruel to her subordinates and after Waxy dies even takes control of the monastery and uses the religion completely to her advantage.
As with most nuns who have lived in the monastery for this long, Susan has much knowledge of the Bible and can cite most things out of it. Aside from that she keeps becoming more and more skilled in medicine, surgery and all things related after picking up these things after Leah's absence.