Heather Sinclair is a fictional, unseen character on Degrassi: The Next Generation. She was known at Degrassi Community School as the all-around queen bee. She was supposedly pretty, smart and popular, as well as mean. Her number one enemy was Paige Michalchuk, who admits that Heather is the only person meaner than her.
She's never actually shown on the show, and therefore serves as a running gag (as the unseen character is a popular literature device).
I got that off the wiki for degrassi.
Have you seen the new show "18 to life"? Stacey Farber (Ellie from degrassi) is in it!! I'm obsessed!