Homer Simpson, voiced by Dan Castellaneta, is the patriarch of The Simpsons and is definitely the main character. Homer is an overweight, slob and a terrible father, but genuinely tries hard.
Homer previously had a job as safety inspector at Mr. Burns' Nuclear Power Plant, but good luck finding out what he's been doing for a living the last few years.
Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Bart: You're going down, Homer. I'm gonna fool you!
Homer: You talk better than you fool.
Bart: I'll fool you up real nice.
Homer: You couldn't fool your mother on the foolingest day of your life if you had an electrified fooling machine.