Nancy Bobofit

Nancy Bobofit was a red haired, freckled human who went to Yancy Academy, Percy's sixth grade school in The Lightning Thief.

Personality
She was described as a kleptomaniac, an addiction to stealing, with curly red hair. Percy hated her because she was always teasing Grover and himself. She was the teacher's pet of Mrs. Dodds.

The Lightning Thief
Nancy was the first victim of Percy's demigod powers when 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. 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. When Percy first saw Clarisse, he said that she looked like Nancy, but was older and stronger looking.

In the Film
In the film of the book, a boy called Drew Bobofit appears, but with the same role as Nancy's role.