Burton Guster, often referred to as Gus, is a fictional character from the television series Psych. He is portrayed by actor Dulé Hill and serves as the best friend and business partner of the show's main character, Shawn Spencer. Gus is known for his intelligence, loyalty, and a strong sense of responsibility, often balancing Shawn's more carefree and impulsive nature. In the series, Gus works as a pharmaceutical sales representative, which often provides him with valuable knowledge that aids in their investigations. His character adds humor and depth to the show, frequently showcasing his love for pop culture and his various interests, including video games and music.