Ray Magini

Ray Magini is a roofer who Homer ends up being friends with.

Profile
Everyone thought Ray didn't exist and that Homer was the only one who saw him. Ray makes an appearance in front of the townspeople at the end of the episode, proving he does exist and is not just a product of Homer's imagination. Ray Mangini is an anagram for "Imaginary". The Bartender at Knockers couldn't see him because of his eye patch, Flanders couldn't see him because he hid behind the chimney, and Bart couldn't see him because of a mini black hole absorbed the light from Ray, later explained by Stephen Hawking.

Occupations
Ray is a roofer (although he doesn't seem to have received much education in roofing). He also sometimes stacks items in hardware stores.

Behind the Laughter

 * Ray Magini is voiced by Ray Romano and is designed to look like and talk like Ray Romano.
 * His name is an anagram of 'Imaginary'. (This was pointed out by Lisa).