No since Percy's not even in the Lost Hero. The book mentions his name from time to time, but that doesn't mean Percy is actually in the book.
Annabeth does not find Percy at the end of 'The Lost Hero'. However at the end of the book, she finds out that Percy is at the camp for Roman demigods. Percy might appear in the second book, 'The Son of Neptune'.
So far, no
No
Percy's dad was Poseidon. He did not die. Before he knew who he was, his mother would tell him he wasn't dead, but lost at sea.
No. Nico is not even shown in peron in the book.
Festus [a metal dragon] and some monsters and demons but no heroes.
Grover marries Juniper, a wood nymph, and becomes the Lord of the Wild before the events of "The Last Olympian." In the story, he helps Percy and the other demigods fight against Kronos and his army in the Battle of Manhattan. Afterward, he continues to protect nature and the environment as a loyal friend and protector of Percy and Camp Half-Blood.
No, he did not.
Percy Collick died in 1984.
Percy Wickman died in 2004.
Percy Galbraith died in 1961.
Percy Turrall died in 1941.