Everyman

Everyman (Avery Mann) is a superhero created by Comic Book Guy. Homer portrays him in the film adaptation.

History
Bart and Milhouse discover that Comic Book Guy has been creating a series of comics, and instead of mocking him, are in fact interested in the series. He begins publishing the issues he wrote which number well over 300, and the series becomes a hit - quickly leading to its own movie. Comic Book Guy rejects every actor who auditions, until Homer comes into the store, he immediately chooses him. To prepare for the role Homer gets personal trainer, Lyle McCarthy, to get him into shape (despite the original character himself in fact being out of shape, hence the name Everyman). Homer makes it through half the shooting before Lyle leaves thus allowing him to lose the motivation to stay thin. They continue shooting the movie, which causes many scenes in which the character changes physique randomly.

Superhero
Everyman's real identity is a mail carrier called Avery Mann. When he turns into Everyman, he can touch a comic and receive the powers of that comic's superhero. In one issue, a bank was being robbed and, when Avery Man saw it, he hid and came back as Everyman. He then touched a comic of Iron Man and took his powers. The robbers shot him, but the bullets didn't hurt him. One robber surrendered easily, but the other tried to make a run for it, which caused Everyman to absorb the powers of Plastic Man to entrap him in a makeshift cage.

Everyman's name isn't just a pun on his real name, and doesn't just represent his powers. His out of shape body, uninteresting job and lack of grace is meant to represent the average man. Moreso than other superheros who are almost always perfect with super model bodys and are often rich or have non menial jobs. Hollywood however didn't like the idea and strived to turn Homer into the more classically physically attractive type of hero so people would see the person they want to be instead of the people they are. And that's why the movie failed.