The underworld is owned by him.
Hades.
Calypso
Steward of Odysseus.
Mentor
Father of the big three.
Cronus
The main character
Percy Jackson.
The second son of Cronus.
Poseidon
Eldothea
Youngest sailor with Odysseus.
Elpenor
Father of helios.
Hyperion
Percy Jackson's friend who happens to be a Satyr.
Grover Underwood
Featured in a famous video game series and has the Roman name of Mars.
Ares.
Keeper of the winds.
Aeolus
Wife of Odysseus.
Penelope.
Previous god of ocean to Poseidon.
Oceanus
Daughter of Athene.
Annabeth Chase
Messenger of the gods.
Hermes
Daughter of the sun and goddess of the wild.
Circe
Keeper of the cattle.
Philoetius
The Titan of intellect.
Coeus.
Son of Hades.
Nico Di Angelo
What the Romans called Jupiter.
Zeus
One of the gods overthrown by Zeus.
Proteus
King of Ithica.
Odysseus
Titan of mortality.
Iapetus
Percy's mother.
Sally Jackson