Lucy is a magical researcher who works for the Elgos Order that exists with the objective to fight Dracula threats and guard his material possessions along the Grimoires that contain records from many timelines. She came into the Elgos Order some time after Hermina's abrupt departure, where she played a key role in restoring the Grimoires that had been destroyed by Hermina. She partners with Arikado during the initial act of the game, and was responsible for sending him the letter notifying him about the Grimoire awakening and causing darkness to spread. She has the power to make characters come alive from the Grimoire.
She plays a supporting role by introducing new concepts to the player and elaborating on the story. She guides the player through various tutorials on the game's numerous features and also acts as a merchant (or host) during in-game purchases.
- Her name is based on Lucy Westenra, a character appearing in Bram Stoker's 1897 novel, Dracula.
- She wrote a romantic manuscript involving a spirited girl and a quiet boy, with the girl struggling with her love for the latter, which Maria, Shanoa, and Charlotte discovered, much to Lucy's embarrassment.