Percy Jackson author Rick Riordan and co-author Mark Oshiro originally planned for that tale to be a one-book-wonder. Season 2 of Percy Jackson drops in December 2025, with a premiere date for Season 3 TBD. Riordan and Oshiro on being Co-AuthorsRick Riordan is the mastermind behind Percy Jackson and wrote all the books by himself before bringing Oshiro on for The Sun and The Star. Oshiro's passion paid off as Percy Jackson readers have accepted them with open arms, as Oshiro said they "love that everyone's like, 'Oh, you're like the Percy Jackson gay uncle now. Also check out Rick Riordan and Mark Oshiro on tour as they celebrate the release of The Court of the Dead.