Polyphemus

Polyphemus is a cyclops who inhabits an island in the Sea of Monsters. He stole the Golden Fleece, in order to make it easier for him to eat. This meaning that the Golden Fleece has a natural smelling scent (which gives off the same, if not extremely similar scent) of the Nature god Pan. Pan disappeared centuries ago, until Percy, Grover, Nico, and Annabeth discovered him hidden in the labyrinth. Satyrs would try to find Pan and since the labyrinth blocked off any scent of Pan, the only thing giving off his scent would be the Golden Fleece. So Satyrs searching for Pan would travel to Polyphemus's island, but would only meet their demise. And the only satyr who was not devoured by the glutton, was Grover Underwood, who put on a wedding dress, and impersonated a female cyclops. Polyphemus was not able to tell that Grover was not a real cyclops, because of an incident that happened many centuries before. In which the famed hero, Odysseus was about to be devoured by the cyclops, but he put on an article of clothing to turn him invisible. Polyphemus was baffled. Odysseus was trying to distract him, and told the cyclops that his name was "Nobody". Believing this, Polyphemus would follow the sound of his voice and eventually fell, and Odysseus stabbed him in the eye, resulting in many cataracts and partial blindness. Polyphemus was tricked by Annabeth saying that she was "Nobody", and Polyphemus wanted his revenge, and in doing so, he was almost stabbed in the eye, again. But Percy was reluctant in some ways, and decided not to. Polyphemus is also a son of Poseidon and since he seldom sees another cyclops he tried to persuade Tyson to stay with him, and learn to be a "real" Cyclops. Tyson said "No". Which triggered Polyphemus to throw a tantrum and almost sunk the boat, in which Percy, Grover, Annabeth, and Tyson were going to escape in. In the end, Polyphemus lost the Golden Fleece, which caused his island paradise, to become the hideous object it was before. But he still had his demonic sheep to keep company, and most likely later eat.