In the seriesEdit
Sometimes helpful, sometimes antagonistic, the Leanansidhe is a long-term presence in Harry Dresden's life. Her help is often essential to Dresden's activities, from his defeat of Justin DuMorne, to his retrieval of his daughter from the Red Court.
Dresden owes her some important debts, which she has sold to Mab, ultimately leading Dresden to assume the Winter Knight's Mantle. However, in Dresden's period as a ghost, she takes charge of Molly Carpenter's training in fighting and survival, which allows Molly to go through a tough life on the streets.