Percy Jackson!

Percy: he is reading about Titans so he can learn how to defeat one Nico: he is also reading, but he is reading about shadows, he can control shadows and the dead Grover: he is walking through the forest, he is a Satyr, which is a half-human, half-goat creature Luke: he is looking for a book in the library, where they all are Tyson: he is Percy's half-brother and a cyclops, he is sitting next to Percy, reading the same book, everyone else is outside the library or inside