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.
(reading his poem)Homer
There once was a rapping tomato,
That's right I said rapping tomato,
He rapped all day from April to May,
And also guess what, it was me.
Bart: Hey, Mom. Did you save Dad's love letters?
Marge: Of course I saved them. Well actually, there's only one. It's more of a love postcard from some brewery he visited.
Homer: Maybe it's the beer talking, Marge. But you've got a butt that won't quit. They've got these big chewy pretzels here (undecipherable slurring) five dollars?! Get outta here!
Bart: Wow, the side of Dad I've never seen.