Cartoon villains are characters in animated shows or films who typically oppose the hero or protagonist. They often have exaggerated traits, such as a sinister laugh or a dramatic appearance, which make them memorable. These characters usually have clear motives, like seeking power or revenge, and their actions drive the plot forward. Common characteristics of cartoon villains include their use of clever schemes and humorous antics. They often possess unique abilities or gadgets that help them in their plans. Examples of famous cartoon villains include The Joker from Batman: The Animated Series and Dr. Doofenshmirtz from Phineas and Ferb.