Who is going to be the main character in the siguiente book of the heros of olympus, book two, is it percy o not?

We don't know that yet. But Rick did say that 'the son of neptune' is referring to Percy. So I think he is.

hmmm... thats a hard question... i think Percy is going to be ONE of the main dudes...

Yes and no. We can be 99.99% sure that Percy is the Son of Neptune, but i don't think it will have his POV. I think the story line will go with Piper, Jason, and Leo building the Argo II as Jason begins remembering más and más about the Roman Camp. I belive that Percy will be a major subject that comes up a lot in conversations, but I don't think he'll ne a main character.

Sorry to disappoint anyone, but I don't think Percy will be. Rick Riordan specifically stated that the characters from the first series will be in the new one but they won't be main characters. I think the Son of Neptune will be about Jason, Piper, Leo, and Annabeth (Jason asked her to come with them) going to California to get Percy back. I think that por the end of the siguiente book we will be seeing Percy again.