List of characters in the Camp Half-Blood series
Calypso - Calypso first appears in book four. She nurses Percy back to health on her island. She is shown to be in love with Percy, and is heartbroken when he leaves. She is cursed with this as punishment because she supported her father, Atlas, the Titans in the first war. Near the end of The Last Olympian, she is freed from her punishment as part of Percy's wish. She is immortal and lived on an island that makes anyone who lives there immortal for the time of their stay, though once they leave they can never come back.