Don't be deceived দ্বারা the শিরোনাম of this article. I don't actually know who the Seventh Half-Blood is. But i do have some theories. Well actually, One theory.
Nico Di Angelo
1. Why him? He hasn't been seen much in the series. Even in Percy Jackson he wasn't really in the limelight for very long. Well that's one good reason why it could be him. This could be Nico's 'Time to Shine' (that sounded much lamer than i meant it to). Rick Riordan had probably been saving Nico, reserving his character for this big part (assuming he is the seventh half-blood).
2. It would make sense to have one child each of...
Sorry if you've already known this. I পোষ্ট হয়েছে this প্রবন্ধ a long time পূর্বে on the PJO club, but Hecate thinks it should be পোষ্ট হয়েছে again here, and I agree with her, since it's a very good interview and it gives us some useful clues about what will happen in the পরবর্তি series.
You can see the original প্রবন্ধ link. Visit link for further information.
Q: The presence of the entire minor god’s offspring is going to greatly change the dynamics of Camp Half Blood and not just দ্বারা all the new cabins. Will a rivalry arise between children of the major gods and the children of the minor gods? RR: A lot...