Percy Jackson fans - the 7 demigods! - I think I know who they are?

Well, we know for sure Jason, Piper and Leo. I think Percy's guaranteed; since Hera used him for the switch. Annabeth's a possibility, but we can't be too certain. Then of course there's going to be Roman demigods, but we don't know many besides Jason. Thalia's also a possibility, even though there's already someone for Zeus/Jupiter she could still be one of the seven. Well, we'll know for sure soon enough.It'd be awesome if you actualy got it right.