|Appearances||The Lightning Thief|
Nancy was the first known victim of Percy Jackson's demigod powers. According to the book, the water from a nearby fountain "reached out and grabbed her" on a school field trip in Manhattan. However, she simply claimed Percy "pushed" her, knowing he would get into trouble for it. That was when Alecto's (who was posing as Mrs. Dodds) suspicions were confirmed that Percy was a half-blood or (more specifically) the demigod son of the sea god, Poseidon.
She is described as being a kleptomaniac (someone who has an addiction to stealing). Percy hated her because she was always teasing Grover such as throwing pieces of food at him (such as her peanut butter and ketchup sandwich). Percy couldn't resist trying to "fix her up," but was blamed in the graphic novel that he pushed her in a fountain of water. She was Mrs. Dodds' teacher's pet, allowing her to get away with anything, including her bullying and pickpocketing.
Nancy is described as a girl with curly red hair, orange freckles, which Percy describes "looks like they were sprayed on with liquid Cheetos" and crooked teeth. Percy said that Clarisse La Rue reminded him of Nancy, but Clarisse was stronger looking and much bigger.