Lucy is a character in the ABC series Once Upon a Time. She is the daughter of Henry Mills and Cinderella, and makes her first appearance in "The Final Battle Part 1". She is portrayed by Alison Fernandez.
In the Enchanted Forest, during a time of great upheaval, Henry is chased by an unknown entity, and heads to a hut, where Lucy sleeps. Waking her up, he informs his daughter that they have been discovered. She is given the Once Upon a Time book which she vows to protect with her life. Requesting her to get to safety and share the stories, he says his goodbyes to her and has her escape, as he stays back to fight the incoming opponent. Returning to her home the following morning, she finds her house in ruins, and begins to cry, until Tiger Lily arrives. Regretting her decision to leave, Tiger Lily makes it clear that she was right to follow her fathers instructions, having kept the book safe. She then instructs her to head to her mother who is waiting, before revealing the fairies prophecised the reunion between her and her father, however, the future is unclear, and she cannot state whether they will be alright. She then advises Lucy to never lose hope.
Between this time, the Dark Curse is cast and Lucy is sent to Hyperion Heights, though he still retains her memories.
Lucy travels to Seattle with a book containing the history of her family. Heading to an apartment, she knocks on the door, and finds a man who opens it and greets him, asking if he is Henry Mills. When he confirms his identity, she reveals herself to be his daughter, to his disbelief. Maintaining who she is, she urges Henry to help his family who are in danger.