Damien Thorn
| Gender | Male |
| Age | 10 |
| Hair Color | Black |
| Occupation | Student |
| Grade | 4th Grade |
| Aliases | Son of Lucifer, Son of the Evil One |
| Religion | Satanism |
| Father | Satan |
| Voiced by | Matt Stone |
| First Appearance | Damien |
He is the son of the Devil. He comes from Hell to challenge Jesus to a fight with his father, Satan. Everyone at South Park Elementary makes fun of him and calls him "Fartboy"...although he winds up winning them over at the end by making fun of Pip. He is based on the character Damien from the 1976 horror movie, "The Omen".