Nancy Panko is a character that appears in Doug. She is a student at the Bluffington School and is in the same class as Doug. Her debut is in Doug's Secret Admirer.
Background
Doug thought Nancy Panko and/or Vanessa Van Holton were the ones who wrote his secret admirer note. Doug imagined that they were madly in love with him, wearing all sorts of "Doug" gear and even have a sonar tracker on him. It turned out that this was false, and they were not the ones who who wrote the note.
Later in the episode, she is seen talking to Patti Mayonnaise and is part of the Beetball team.