Characters in The Son of Neptune

Percy Jackson

A powerful demigod son of Poseidon/Neptune who arrives at Camp Jupiter with his memory stripped away.

Also in The Lightning Thief, The Sea of Monsters, The Demigod Diaries, The Mark of Athena, The Titan's Curse, House of Hades, The Battle of the Labyrinth, The Blood of Olympus, The Last Olympian, The Chalice of the Gods

Hazel Levesque

A daughter of Pluto carrying a dangerous secret about her past.

Also in The Mark of Athena, House of Hades, The Blood of Olympus, The Tyrant's Tomb

Frank Zhang

A clumsy son of Mars whose life is bound to a half-burned piece of firewood.

Also in The Mark of Athena, The Blood of Olympus, The Tyrant's Tomb

Octavian

Power-hungry augur who reads auguries and distrusts Percy

Also in The Blood of Olympus

Gaea

The primordial earth goddess raising giants to topple the gods.

Also in The Lost Hero, The Mark of Athena, The Blood of Olympus

Reyna

A praetor and leader of Camp Jupiter.

Ella

Knowledge-hoarding harpy rescued from the blind seer Phineas

Thanatos

God of death held captive in Alaska, whose freeing is the quest's goal

Hera

Also in The Lost Hero, The Titan's Curse, The Battle of the Labyrinth, The Blood of Olympus, The Last Olympian

Juno (Goddess)

Also in The Lost Hero, The Blood of Olympus