Thalia Grace is a daughter of Zeus. She is Jason's older sister and the cousin of Percy Jackson and Hazel Levesque and Bianca and Nico di Angelo. Grover Underwood was assigned to watch over her when she ran away from home at ten years old. On her journey, she met Luke Castellan and Annabeth Chase. They also had brief encounters with the Hunters of Artemis and she was enticed to join by Zoë Nightshade. When she was twelve, they were all soon attacked by a herd of monsters and caught by a Cyclops in New York. She was captured, but thanks to Annabeth, was freed. They meet the satyr Grover Underwood on the way. They escaped, but found that the monsters they had briefly escaped caught up to them. As they reached Half-Blood Hill, Thalia sent Luke, Grover, and Annabeth over the boundary line while she faced the monsters. She sacrificed her life for her friends, and her father, Zeus, took pity on her and transformed her to a pine tree. She is later brought back to life by the Golden Fleece and joins the quest in the third book where she ultimately joins the Hunters, taking the place of Zoë Nightshade. She has a younger brother, Jason Grace who was separated from her when she was 10. This became the reason she ran away from home.She wears a lot of dark makeup and punk style clothing. She has electric blue eyes and spiky black hair. She is so like Percy that according to Annabeth, they either could be best friends... or worst enemies.