|First seen||"Three Men, a Woman, and a Baby"|
|Last seen||"Sleepless in Peckham"|
|Date of birth||3 February 1991 (age 25)|
|Family|| Derek (father)|
Joan Trotter Jr. (half-cousin)
Joan Trotter Sr. (grandmother - deceased)
Ted (great grandfather - deceased)
Vi (great grandmother - deceased)
Albert (great great uncle - deceased)
Ada (great great aunt - deceased)
George (great great uncle)
Jack (great great uncle)
Damien is the only child of Del and Raquel and nephew of Rodney Trotter. A recurring theme in the show was Rodney's fixated belief that Damien was literally the Antichrist despite the fact that Damien shows no resentment nor intentions of harm toward anybody except Rodney himself. Del and Raquel chide Rodney for his mad obsessions and believe Damien to be a perfect angel, spoiling him frequently.
From the earliest ages, Damien shows signs of being a spoiled brat, such as throwing things at Rodney, throwing seeds on the floor, deliberately waking Uncle Albert up from a nap, placing Cassandra's birth control pills inside an urn containing Albert's ashes, urinating in a public swimming pool (from the top of the diving board), encouraging his father to physically fight someone at a funeral, and even hoping that his father might get sent to prison merely to fit in with his group of friends with imprisoned fathers. Del and Raquel seem to remain oblivious to Damien's bad behaviour, and Rodney frequently calls him or refers to him as "Rat Boy".
He was named after Del and Raquel could not decide on a name for their unborn baby (Raquel thought of Aron, pronounced airon, but Uncle Albert thought the kids would nickname him Aron a G-string and Del thought Troy, but the name Troy Trotter was instantly dismissed), so Rodney sarcastically suggested that they name him Damien as Rodney was convinced that the baby would be born half-demon. To his horror they adored the name and Rodney desperately tried to get them to change their minds, offering the name Derek which led to his middle name (and resulting in the initials D. D. T.) Damien was born under a full moon and during the birth, Rodney even went as so far as to ask Del if the baby had been born with the numbers '666' branded on its forehead. When Damien was born Del held him in his arms and introduced him to his beloved mother. After Damien was born, Rodney refused to hold him or share a room with him. In some episodes when Damien was a child Rodney seemed more relaxed around him but his fear arose again when Damien became a handsome and popular teenager who delighted in tormenting Rodney.