Jeff Jefferies is a fictional character from the animated television series Family Guy. He is known for his quirky personality and unique way of speaking, often providing comic relief in various episodes. Jeff is depicted as a friend of the main character, Peter Griffin, and is characterized by his childlike innocence and enthusiasm. In the show, Jeff often finds himself in humorous situations, showcasing his loyalty to his friends. His interactions with other characters, such as Lois Griffin and Stewie Griffin, highlight his role as a lovable, albeit naive, figure within the Family Guy universe.