If you went to Camp Half-Blood, who would be in your friend group? It could be your PJO friends IRL, minor campers in the books who you just think you would be friends with, or maybe even Percy Jackson! There is one rule though: It cannot be all the major characters. It has to be people you would actually think you would get along with. I'll start:
Rowan, My PJO friend IRL
Connor Stoll
Nico di Angelo
Will Solace