William Afton, better known by his fake name Dave Miller and commonly known as Purple Guy, is the main antagonist/deuteragonist of the Dayshift at Freddy's trilogy.

He serves as the main antagonist or deuteragonist of Dayshift at Freddy's and Dayshift at Freddy's 2: Electric Boogaloo depending on the choices made by Jack and the deuteragonist in Dayshift at Freddy's 3.

In the first two games, he serves as the main antagonist in majority of the main routes.