Sebastian Sallow is a Scottish Dark wizard and a Slytherin student at Hogwarts School of Witchcraft and Wizardry.

Sebastian's parents was both professors who died when he was young, he and his sister, Anne, were raised by their uncle Solomon Sallow, an ex-Auror. When Anne was cursed by Victor Rookwood, she developed a seemingly incurable illness. His quest to unravel the secrets of Dark Magic, justified by finding his sister's cure, eventually culminated in the murder of his uncle.