List of characters in the Camp Half-Blood series
Geryon - In this series, Geryon is described as having a normal head where his face was weathered and brown from years in the sun, slick black hair, a pencil-thin moustache, two very beefy legs wearing a very large pair of Levis and each of his chests wore a different colored shirt: green, yellow and red. In "The Battle of the Labyrinth," he is the owner of Triple G Ranch with Orthrus guarding the ranch. He gave Percy an impossible task. To clean out the stables of carnivorous horses (one of the tasks Hercules also did). Once Jackson completed the task, Geryon went back on his deal to let his friends free and the two fought. Jackson found Geryon a worthy battle as he was a challenge due to his three hearts which allowed him to be almost impossible to defeat. Jackson defeated Geryon with a well placed arrow (thanks to Hera) that went through Geryon's sides hitting all three hearts at once killing Geryon.