Percy Jackson has meet every Olympian including Hades and Hestia through out the Percy Jackson and the Olympians series.
The Lightning Thief: Dionysus, Ares, Hades, Poseidon, and Zeus
The Sea of Monsters: Hermes
The Titans Curse: Artemis, Apollo, Aphrodite, and Athena
The Battle of the Labyrinth: Hera, Hephaestus
The Last Olympain: Hestia, Demeter
