Carter Jennings is the younger son of Bradley and Corrine Jennings, and the younger brother of Gabriel. He is also the nephew of Dallas and Ailey Montgomery, and the cousin of Caleb and Scarlett. Carter is five-years-old, much too young to have a Pokemon but he enjoys spending time with his mother's Meowstic who is often the babysitter of the young child.

Despite his age, Carter understands why Espeon is always near his older brother. Carter does try to help his brother when he has an episode.