Harry described her as as having "scathing intellect and penetrating wit" and she is "unafraid to challenge anyone". Stern is described as just over five feet tall, pleasantly plump, and of Asian ancestry. She wears thick glasses and has curly black hair.
She is a reporter for Midwestern Arcane, having taken over Susan Rodriguez's position. Rather than merely discussing supernatural events, she investigates these strange events and demands to know why the authorities do nothing about the supernatural.
- Main article: Proven Guilty
In Proven Guilty, Harry Dresden asks Lydia for a favor, to stand outside a door and just be herself, in exchange for a ten minute interview on the case. On the other side of that door is Detective Greene illegally interrogating Molly Carpenter, a minor without parental consent. Lydia Stern obligingly and happily acts as Harry Dresden's guard dog, incidentally helping to get Molly out from under Green's grilling and getting an additional story on Greene in the bargain.