User blog comment:LightningThief/Will Percy also have a Quest to gain trust from the Roman Camp Half Blood?/@comment-3178612-20101102095044

I'm totally sure he's one of them since he's also a child of the big three and these are the most powerful. Plus, he bathed in the Styx and has useful powers for traviling over the sea. So there are only three Demigods left. Thalia is also still there but I'm not sure about her. But yes, I guess he's going on a quest and finds some friends, gains their trust and maybe some of these friends are pretty strong, that's also possible. :)