Relationships

 Percy and Annabeth- 

''This relationship was officially established by the Last Olympian, where Percy and Annabeth take their fourth kiss. It goes on in the Lost Hero, despite Percy being at the Roman camp and possibly being followed by another girl.''

 Luke and Thalia- 

''This relationship is unofficial, due to Luke liking Annabeth. But it is hinted that Thalia loves Luke, because in the Titan's Curse, she says she has a bad past with Zoe because she didn't want to join the hunters and leave Luke.''

 Beckendorf and Silena- 

''This relationship is official as of the Last Olympian. Beckendorf has had a not-so-secret crush on Silena for four years, as said by Percy in the Demigod Files. Silena, who is a daughter of Aphrodite, doesn't care about jewelry when it comes to Beckendorf.''

Jason and Piper-

''This relationship is unofficial, because of their relationship just being a trick of the Mist. Piper, although, decides she still likes Jason, who shares the same feeling. Though this relationship may be broken due to Drew, who has feelings for Jason, too.''