Geryon

Geryon is the son of Chrysaor and Callirrhoe and grandson of Medusa, was a fearsome giant who dwelt on the island Erytheia of the mythic Hesperides in the far west of the Mediterranean. A more literal-minded later generation of Greeks associated the region with Tartessos in southern Iberia.

Appearance
Geryon was often described as a monster with human faces. Geryon had one head and three bodies with a total of two arms. Some accounts state that he had six legs as well while others state that the three bodies were joined to one pair of legs. Although there are some mid-sixth century Chalcidian vases portraying Geryon as winged, it is not known whether Stesichorus' Geryon had wings: it seems unlikely. Apart from these strange features, his appearance was that of a warrior.

In the book, he is described as having a normal head. His face was weathered and brown from years in the sun. He had slick black hair and a pencil-thin moustauche. He had two very beefy legs, wearing a very large pair of Levis. Each of his chests wore a different coloured shirt: green, yellow and red.

The Battle of the Labyrinth
In The Battle of the Labyrinth Geyron owned a two-headed hound named Orthrus, which was the brother of Cerberus, and a herd of Apollo's magnificent red cattle that were guarded by Orthrus, and a herder Eurytion, son of Ares. Geryon is the owner of Triple G Ranch, with Orthrus is guarding the ranch. He gave Percy an impossible task, to clean out the stables of carnivorous horses which was also one of the tasks Hercules did. Once Percy 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. Percy defeated Geryon with a well placed arrow (later revealed to be thanks to Hera) that went through Geryon's sides hitting all three hearts at once, thus killing Geryon.

Trivia

 * When cooking he wears an apron on each chest, with one word on each, together they spell "Kiss - The - Chef"