Have you seen exemples of a "Poochie"?

In the Simpsons, Itchy and Scratchy introduce a new character (Poochie) who steal the spotlight with the show saying how awesome he is. In result, nobody in-universe like him before the producers decide to get rid of him killing him offscreen on the way to his home planet.

Ever seen a character constantly shilled that nobody liked before disapearing from the work?