Annabeth Chase is a fictional character in Rick Riordan's "Percy Jackson and Heroes of Olympus" series. She is a demigod, meaning she is half-mortal and half goddess. Her father is the mortal Frederick Chase and her mother is Athena, the goddess of wisdom, crafts, arts, and battle strategy. She is first cousins with Magnus Chase, whose mother is her paternal aunt. She appears first in the first novel of the series, "The Lightning Thief". Throughout the series she becomes close friends with Percy Jackson, later becoming his main love interest and girlfriend.