Roger Klotz is a fictional character from the animated television series Doug, which aired on Nickelodeon in the 1990s. He is known as the main antagonist and is often portrayed as a bully who targets the show's protagonist, Doug Funnie. Roger has a distinctive appearance, characterized by his green skin, spiky hair, and a casual style of clothing. Despite his tough exterior, Roger's character often reveals deeper layers, showcasing insecurities and a desire for acceptance. Throughout the series, he interacts with various characters, including Patti Mayonnaise and Skeeter Valentine, contributing to the show's themes of friendship and personal growth.