Duchess is an antagonist of Cartoon Network's Foster's Home for Imaginary Friends. She is an arrogant imaginary friend who believes herself to be perfect. She is often bossing the staff of the Home around, ensuring that they do stuff perfectly such as washing her "fine linen" separate from the other clothes. She appears to come from India, with an elephant nose and Indian clothing.
One of her most villainous acts was the attempted murder of Bloo (along with Wilt, Eduardo and Coco) by releasing an "Extremeosaurs" on him. Since then she is always antagonizing the imaginary friends and the staff. She tricked Terrence into becoming her henchmen.
In her first appearance in the show's first ever episode, she served as the hidden main antagonist.