Ronald Grump, a parody of billionaire Donald Trump, appeared in the 1994 25th anniversary TV special Sesame Street All-Star 25th Birthday: Stars and Street Forever!.
In the special, he wants to demolish Sesame Street to realize his plans for The Grump Tower. The Sesame Street residents inform Grump of the many wonderful moments in the neighborhood that have happened over the years, but none of it changes his mind. "If there’s one thing I despise," Grump says, "it's cheap sentiment. Hugs, kiddie television, cute, furry animals..."
There was also a grouch named Ronald Grump, who appeared in Episode 2399.