List of Percy Jackson and the Olympians characters
Typhon: A very powerful monster. He sired many monsters by Echidna. He lives and sleeps inside Mount Saint Helens. Percy is such a powerful demigod that he almost wakes Typhon during his visit there. In The Last Olympian, he awakens and moves across America while destroying everything in his path. The gods of Olympus try to stop him but he is too powerful. In the end, Poseidon and his army come to help defeat him.