Elliot Larson is a tall, nice-looking man of average build.
Not much is known about Elliot's early life. His wife's name was Kate, and they had two children.
A few weeks after the Morgans moved into the neighborhood, Elliot and his wife started to have problems. Dexter and Rita could hear them loudly arguing. This led led to a separation, with Kate moving out the house. This left Elliot as a single father. Much to Dexter's annoyance, Elliot started to spend more time at the Morgans' and with their children. In time, Elliot began to develop a romantic interest in Rita. During Thanksgiving, he shared a kiss with her, which was witnessed by Vince Masuka. When Dexter found out about the kiss, he later punched Elliot in the face.
After Rita's death, Elliot was interviewed as a potential witness and suspect, but he was cleared. While Dexter was packing up the house, Elliot apologized to Dexter for kissing Rita. While holding a kitchen knife, Dexter momentarily considered stabbing Elliot. Later, Elliot met Lumen Pierce during the brief time that she stayed at Dexter's otherwise unoccupied house.
- In the credits, his name is spelled as "Elliot" - not "Elliott".