Pie Man
Pie Man is a ridiculous 'so-called' superhero that Homer made up in the episode Simple Simpson when the Rich Texan was taunting Lisa at the county fair. He had been previously warned by the police that he'd go to jail if he committed another assault, so he used a quilt as a cape and an empty pie tin with eye and mouth hole cut out for a disguise to avoid recognition and then hit him with a pie to humiliate him. From that point on, he smashed pies in wrongdoers' faces as 'Pie Man'.
Sidekick
At the end of the episode Simple Simpson Bart appears as a super hero called Cupcake Kid, but his powers are unknown. However, in a few Simpson comics, Cupcake Kid is featured to be skilled in the art of throwing cup cakes, and goes on an adventure with Bartman and Stretchdude to defeat a much more malicous Bart. Later, they stop him and they go back to there own universe, and everyone's happy. Or are they? Yes they are. Or are they? No they're fine. Or are they?...(etc.)
Other apearrences
Outside of Simple Simpson, Homer has once again donned the Pie Man costume in some issues of Simpsons Comics.