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Also known as: Seaweed Brain, The Son of Poseidon
| Ability | Type | Description | From |
|---|---|---|---|
Hydrokinesis | Greek Demigod Powers | Control over water, ability to breathe underwater, communicate with sea creatures. Enhanced strength near water. | |
Curse of Achilles | Other | Invulnerability except for one weak point. Gained by bathing in the River Styx in The Last Olympian. |
| Occupation | From |
|---|---|
Student | |
Soldier |
| Group | Role | Description | From |
|---|---|---|---|
| Camp Half-Blood | Member | The training ground for Greek demigods, hidden in the hills of Long Island behind a magical barrier. Run by Chiron the centaur and the perpetually aggrieved Dionysus. Most Greek demigod characters are members at some point, though belonging to the camp is always complicated by the knowledge that the mortal world cannot know it exists. | |
| Camp Jupiter | Member | The Roman equivalent of Camp Half-Blood, located near San Francisco. More militarised and structured than its Greek counterpart, organised into legions with ranks and a Senate. Praetorians govern the camp. Greek and Roman demigods are kept separate to prevent the divine aspects of the same gods from colliding. | |
| The Seven | Member | The seven demigods of the Great Prophecy who sail on the Argo II: Percy Jackson, Annabeth Chase, Jason Grace, Piper McLean, Leo Valdez, Hazel Levesque, and Frank Zhang. The central ensemble of the Heroes of Olympus series. | |
| Crew of the Argo II | Member | The crew assembled for the quest in Heroes of Olympus: Percy, Annabeth, Jason, Piper, Leo, Hazel, Frank, and Coach Hedge. Sail from Camp Half-Blood to Greece and back, fighting gods, giants, and each other's worst instincts along the way. |