He is Scrooge's longtime, no-nonsense butler-chauffeur. Despite having "Duck" in his name, Duckworth is actually an anthropomorphic dog. He worked for Scrooge even before the nephews moved in. He is also Scrooge's chauffeur and errand boy on occasion. Duckworth used to be Scrooge's only household servant until Scrooge hired Mrs. Beakley. He usually appears as a supporting character. His only starring roles on the show are in the episode "Duckworth's Revolt" and the episode-segment "Take Me Out of the Ballgame". He first appears in the first part of the pilot episode. Duckworth is a jack-of-all-trades in the McDuck mansion, making him an important member of Scrooge's staff.
Duckworth was a major character in the original series of DuckTales and appeared in many of it's episodes. His most recent appearance was in the game DuckTales: Remastered. In the reboot he is appears a ghost, and has a much smaller role.