Oncer

Noun

 * 1)  A fan of the television series .
 * 2) * 2014, Matthew Hoekstra, "Once draws super fans to Steveston", The Richmond Review, 21 March 2014, page 1 (image caption):
 * Katy Lewis, a resident of Whitehorse, Yukon, is a 'Oncer'—a super fan of the popular TV show Once Upon a Time.
 * Katy Lewis, a resident of Whitehorse, Yukon, is a 'Oncer'—a super fan of the popular TV show Once Upon a Time.