The Battle of the Labyrinth
Rachel Elizabeth Dare: A mortal who can clearly see through the Mist. Her father is a rich businessman who buys the undeveloped land of the wild and builds developments upon them. She hates her father for doing so and was embarrassed to meet Pan, God of the Wild. Percy had previously met her lover at the lusit  at the Hoover Dam in The Titan's Curse, where she helped him get away from the undead warriors.