Peggy Duck is a schoolmate of Huey, Dewey, and Louie who first appears in "Uma principessa per Quo" (A princess for Dewey) as Dewey's love interest.

She later appears in some stories about Q-Galaxy, a space superhero team formed by Huey, Dewey and Louie. In these stories, Peggy wants to be part of the team, but she's still a mere cadet. However, the Q-Galaxy comic stories are implied to be in-universe fanfiction that Huey, Dewey, and Louie write about in their blog.