Lydia Carlton

Lydia Carlton is the 17 year old fairy doctor daughter of Professor Carlton who has the rare power to see fairies, an ability that she inherited from Aurora (Lydia's mother). She ends up working for Edgar J. C. Ashenbert as his consultant on fairy-related matters after helping him retrieve the Merrow's Sword (the key to him being recognized as the Blue Knight Earl by the Queen of England). Even though she knows Edgar is constantly deceiving her to a point where it brings her harm, she remains by his side and almost sacrifices her life for him.

Her goal is to become a full-fledged fairy doctor, and she frequently places herself in danger willingly when it comes to anything to do with problems between humans and fairies.

Appearance
Lydia is pale-skinned young woman with waist-length or hip-length wavy and slightly light brown ash hair that has bangs swept to the left and green eyes, a trait which is associated with fairies.

Personality
Lydia is a kind and independent young woman who doesn't hesitate to help others. She appears to have some self-esteem issues, referring to her own hair as "rust-colored" and comparing herself to her mother, who was a woman of considerable beauty. Once, in an outburst, she confesses to Paul Ferman that she thinks that she isn't cute at all, and that's part of the reason why she tries so hard to help in other ways by working hard.

Because of past difficulties, Lydia dislikes the idea of falling in love and even seems to be afraid of it. When she was a child, she was given a love letter by a boy who, as it turns out later, was dared to do so by his friends, crushing her. She also used a "spell" to ward off Kelpie so that he wouldn't come near her, as his aggressive advances were troublesome to her. At first, she also rejects Edgar's advances and brushes them off as a joke, but as she falls in love with him, she demonstrates substantially less distrust of his confessions of love.

Current Events
Currently, Lydia is considered to be the fiance of Edgar J. C. Ashenbert, a status she vehemently denies, despite Edgar's overt courtship of her and multiple fairies calling her that. She obtained this status when she accepted a moonstone ring (previously owned by Gwendolen, the countess of one of the past Blue Knight Earls before Edgar), which effectively meant that she accepted his proposal. The moonstone ring apparently has some protective powers of its own; it prevented Lydia's soul from being fully trapped by the fairy world in volume 6 of the novel series, as well as enabled Lydia to break Kelpie's spell on her when he tried to bring her to the fairy world by magic (to prevent her from being hurt in the crossfire between Edgar and the Prince).

Recently, Lydia has truly accepted Edgar's proposal and it is shown that Lydia has hence been accepted as part of the Blue Earl Knight's family (as Edgar's fiancee) afterwards. When she takes what should have been a fatal blow from the Blue Earl Knight's sword, she emerges unscathed, proof that the sword has acknowledged her as the Knight's family. Following this revelation, she becomes able to form a shining bow from Gwendolen's moonstone ring and she is able to use it to repel Unseelie Court. Later, in the light novel series, she marries Edgar (which now makes her Lydia Ashenburt) and they have a son named Alvin Ashenburt.

Aurora
Lydia's mother. She died before the beginning of the series. Lydia looks up to her, and she is the inspiration behind Lydia's determination to become a good fairy doctor. Aurora was born in the Highlands, to the McKeel family (which has deep connections with fairy folk). She died young, supposedly due to an illness.

Alvin Ashenbert
He's Edgar and Lydia's son.

Jimmy
Has the appearance of a young boy with glasses and dark hair, but is really the favorite servant of Ulysses, being a member of the Unseelie Court. He is a spectral hound, and can shapeshift at will. Before Lydia and the others knew what he was, he spied on them by acting as a messenger and friend of Slade and the Scarlet Moon organization, under Edgar.

Trivia

 * The name Lydia means "beautiful one", "noble one", "-kind-" and/or "kindred spirit" in Greek.
 * Lydia has a complex about her hair as many people call it "plain". However, Edgar J. C. Ashenbert claims that it is a "beautiful caramel color".