Role in the Series
Although he was a recurring in both series, Willie's role evolved when Disney bought the series and he became a more prominent character and, while still being a bully part of Roger's clique, developed more of a separate personality from Roger, along with Roger's other two sidekicks Ned Cauphee and Boomer Bledsoe. His lines became much more quotable and perhaps became the funniest character on the show.
Although he never became a main character there were a number of episodes from both Nickelodeon and Disney revolving around him including Doug Runs, Doug Gets his Wish, and Doug's Patti Beef. A usual appearance of Willie in each episode would usually revolve around Willie saying something ridiculous out of the blue and getting corrected by Roger Klotz.
Although his role was minor, Willie remains the most recognizable member of Roger's gang.