Circe

In Greek mythology, Circe is a minor goddess of magic (or sometimes a nymph, witch, enchantress or sorceress) living on the island of Aeaea.

History
Circe's father was Helios (or Helius), the god of the sun and the owner of the land where Odysseus' men ate cattle, and her mother was Perse, an Oceanid. She was sister of two kings of Colchis, Æëtes and Perses, and of Pasiphaë, mother of the Minotaur. Circe transformed her enemies, or those who offended her, into animals through the use of magical potions. She was renowned for her knowledge of drugs and herbs. That Circe also purified the Argonauts for the death of Apsyrtus, as related in Argonautica may reflect early tradition.

In Homer's Odyssey, Circe is described as living in a mansion that stands in the middle of a clearing in a dense wood. Around the house prowled strangely docile lions and wolves, the drugged victims of her magic; they were not dangerous, and fawned on all newcomers. Circe worked at a huge loom. She invited Odysseus' crew to a feast of familiar food, a pottage of cheese and meal, sweetened with honey and laced with wine, but also laced with one of her magical potions, and she turned them all into pigs with a wand after they gorged themselves on it. Only Eurylochus, suspecting treachery from the outset, escaped to warn Odysseus and the others who had stayed behind at the ships. Odysseus set out to rescue his men, but was intercepted by Hermes, who told him to use the holy herb moly to protect himself from Circe's potion and, having resisted it, to draw his sword and act as if he were to attack Circe. From there, Circe would ask him to bed, but Hermes advised caution, for even there the goddess would be treacherous. She would take his manhood unless he had her swear by the names of the gods that she would not.

In the Series
Circe was a female sorceress, who was daughter of Hecate, that ran a magical beauty boutique on an island in The Sea of Monsters. She was extremely glamorous, and sometimes went by the alias of C.C. Although she treated females to a spa treatment, she turned all males into guinea pigs. She formerly turned them into actual pigs, but found them too hard to manage. She had captured Blackbeard and kept the ships in harbor. When Percy Jackson and Annabeth Chase came she turned Percy into a guinea pig. When Annabeth found out, she used Hermes' multivitamins to become immune to Circe's sorcery and free Percy from his curse and make their escape on the Queen Anne's Revenge. When trying to save Percy, she couldn't tell which Guinea Pig was Percy, so she put all of the multivitamins in the cage, freeing all of the pirates that were also captured.

Annabeth and Percy reminisce about this moment in Battle of The Labyrinth, Annabeth saying to Percy that he made a "cute guinea pig". She then gives him a hint that she likes him.

Circe was also the sorceress that turned Odysseus and his crew into pigs because she thought men were just that, pigs. In the Sea of Monsters, her magic was used against her by Annabeth Chase and, because of Hermes's multivitamins, she could not stop Annabeth from freeing the men from their curse and the demigods from escaping, presumably destroying her spa

Odysseus followed Hermes's advice, freeing his men. Odysseus and his men remained on the island for one year feasting and drinking wine. According to Homer, Circe suggested to Odysseus two alternative routes to return to Ithaca: toward the "Wandering Rocks" where King Aeolus reigned or passing between the dangerous Scylla and the whirlpool Charybdis, conventionally identified with the Strait of Messina.

Powers
Eternal Youth

Sorcery: Circe is a goddess-level sorceress. Circe has Nearly limitless magical power.
 * Alter Minds: she can alter minds
 * Energy Blasts: fire destructive magical energy blasts
 * Illusion Casting: create illusions
 * Matter Transmogrification: transform objects and beings.
 * Projective Animal Metamorphing: Her "signature move" is transforming men into various animals.