Ok, so this might sound weird, but I had this idea that Percy was adopted by the Dursleys. But that's not all! When he is adopted he's a year older than Harry. Harry is eleven and Percy is adopted during the school year. You know what this means? Harry's not aware that Percy exists, because Percy's not a wizard. Plea...
Thalia and Reyna get sent to Hogwarts by Artemis, Chiron and Hecate as part of a widespread campaign by the demigods of Camp Half-Blood and Camp Jupiter to form alliances in case they were ever attacked again. This takes place one year after the events of HoO. In this AU, Reyna joins the Hunters shortly after the war...