Phobos

Phobos is the god of fear and the son of Ares. He and his twin brother Deimos were responsible for stealing Ares charriot from Clarisse

Percy Jackson and the Stolen Charriot
Angry that there sister was alowed to ride in Ares chariot, Phobos and Deimos decided to steal the charriot from her. They then hid it in the Stain Island Zoo, and used it as bait to catch there sister and Percy Jackson. He fought Percy but was defeated and disipeared.

Appearance and Powers
Phobos is described as a teenage boy, dressed injeans, a black shirt, and a leather jacket.

Beside the usual god powers, Phobos has the ability to make you see your worst fears.