Percy Jackson, the demigod son of Poseidon, has had a number of admirers over the years. While he was only ever in love with Annabeth and his Mom, a number of other characters have had a crush on him.
Medea, the sorceress, was one of the first to have a crush on Percy. She was initially hired by Luke to help him find the Golden Fleece, but she eventually developed feelings for Percy. She was willing to do anything to be with him, even going so far as to betray her own son.
Reyna, the daughter of Bellona, was another admirer of Percy. She was initially hostile towards him, but eventually developed feelings for him. She was willing to risk her own life to protect him and even went so far as to try to convince him to stay in Camp Jupiter.
Rachel Elizabeth Dare, the Oracle of Delphi, was also in love with Percy. She was the one who helped him and his friends find the Doors of Death, and she even offered to help him find the Golden Fleece. She was willing to risk her own life to help him, and she was devastated when he chose Annabeth over her.
Meg McCaffrey, the daughter of Demeter, was another admirer of Percy. She was initially hostile towards him, but eventually developed feelings for him. She was willing to risk her own life to protect him and even went so far as to try to convince him to stay in Camp Half-Blood.
Calypso, the daughter of Atlas, was also in love with Percy. She was initially hostile towards him, but eventually developed feelings for him. She was willing to risk her own life to protect him and even went so far as to try to convince him to stay on Ogygia.
Finally, Annabeth Chase, the daughter of Athena, was the one who truly captured Percy’s heart. She was initially hostile towards him, but eventually developed feelings for him. She was willing to risk her own life to protect him and even went so far as to try to convince him to stay in Camp Half-Blood.
In conclusion, while Percy Jackson was only ever in love with Annabeth and his Mom, a number of other characters have had a crush on him. Medea, Reyna, Rachel, Meg, Calypso, and Annabeth were all in love with him at one point or another.