They technically are. They tell everyone who reads them information about the entire series. I did for those pickier people anyway.
By the way its Infested no Infected. Its actually a game referance, but it doesn't matter. Although, from my obsession with starcraft, you might have guessed that it involves that.
I think Keymaster means like crews in one piece and organizations in HxH. Am I right? If so, then no, characters are to be from already existing organizations or none at all, although you could make a team of several characters that are part of the one the organizations.