Across
- 3. Percy's grandfather and enemy
- 5. god of the sea, Percy's father
- 6. Percy's friend/cousin
- 7. Percy's main enemy
- 9. Percy's stepmother
- 11. Percy's pen/sword
- 13. Percy's mother
- 15. Percy's friend/cousin, huntress of Artemis, and Annabeth's best friend
- 16. Percy's half brother
- 17. Percy's stepfather
Down
- 1. satyr and Percy's best friend
- 2. daughter of Athena
- 4. Traitor, dies in The Last Olympian, Charles's girlfriend, and daughter of Aphrodite
- 8. Percy's friend, dies in The Last Olympian, Selena's boyfriend, and son of Hephestus
- 10. the river that Percy baths in to become almost invincible
- 12. Percy's half brother
- 14. Percy's friend