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From the Dresden WikiLeanansidhe is usually called "Lea" by Harry and she has made no objection to this, although she has objected to being called a faerie rather than one of the Sidhe.

Lea serves as Harry's godmother because of a deal she made with his mother, Margaret, before she died. We don't know much about the deal other than that she was in a rush, so she wasn’t as detailed as she should have been.

Lea first appeared to Harry before he was adopted by Justin DuMorne, although he did not know who she was other than a lady who did nice things for him, until after his adoption.

Lea made a deal with Harry when he fled from his adopted father, who had tried to coerce him into performing black magic at the age of 16. Lea agreed to give Harry the strength necessary to defeat DuMorne, in exchange for his life, fortune, and power. In actuality Harry already had the strength he needed, so all Lea really gave him was confidence–her torture sessions essentially handed Harry Dumbo’s magic feather: they made him think he was better, stronger, and faster without actually altering a damned thing, otherwise. And it worked. He overcame DuMorne.[3]. This deal was reinforced by another similar deal made by Harry during the course of Grave Peril. The debt from these deals was sold to Queen Mab before the events of Summer Knight.

Lea is considered one of the higher sidhe within the Winter Court and held a position of power up until her imprisonment by Mab. Subsequently, in Changes, Mab refers to the Leanansidhe as her handmaiden and notes that she is second in power within the Winter Court only to Mab herself. She managed to lull the vampire parts of Susan and Martin to sleep, possibly demonstrating a way to treat half vampirism.

In Proven Guilty Lea is shown to be trapped in Arctis Tor, during which she exhibits signs of a personality more ruthless and devious than her dominant one.

Lea claims in Changes that she was being treated for an ailment by Mab during her imprisonment. Despite such 'treatment,' it is still readily apparent that, by mortal standards, the Leanansidhe is less than mentally sound, evidenced by her childlike behavior and excitement at times of extreme violence such as Harry's victory in the duel near the conclusion of the book.

Lea also serves as the new mentor of Molly Carpenter in Ghost Story and the Rag Lady on occasion.

Lea has spent many years attempting to get Harry Dresden to honor his bargain and become hers to which she has expressed the desire to turn him into a hellhound as evident in Grave Peril in which Lea chases Harry Dresden and Michael Carpenter in the Nevernever.

Lea is remarkably powerful considering she is supposedly stronger than the Winter Lady. She can hurl bolts of green lightning, without any apparent difficulty, and like most Sidhe, she is extremely good at veils and illusions.