Characters in The Mark of Athena

Piper McLean

Daughter of Aphrodite who wields charmspeak to influence others

Also in The Lost Hero, The Demigod Diaries, House of Hades, The Blood of Olympus, The Burning Maze

Hazel Levesque

Fifteen-year-old daughter of Pluto who can manipulate the Mist and summon precious metals

Also in The Son of Neptune, House of Hades, The Blood of Olympus, The Tyrant's Tomb

Frank Zhang

Son of Mars and shape-shifter who cares deeply about people and animals

Also in The Son of Neptune, The Blood of Olympus, The Tyrant's Tomb

Annabeth Chase

Daughter of Athena, tasked with a solo quest to follow the Mark of Athena that no demigod has ever survived.

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

Percy Jackson

Son of Poseidon, reunited with Annabeth aboard the Argo II.

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

Gaea

The earth goddess whose giants threaten both camps.

Also in The Lost Hero, The Son of Neptune, The Blood of Olympus

Jason Grace

Roman demigod son of Jupiter, bridging the two camps.

Also in The Lost Hero, The Demigod Diaries, House of Hades, The Blood of Olympus, The Burning Maze

Leo Valdez

Fire-wielding mechanic who built the Argo II.

Also in The Lost Hero, The Demigod Diaries, The Blood of Olympus, The Dark Prophecy

Hades

Also in The Lightning Thief, House of Hades, The Blood of Olympus, The Last Olympian