I think what I love most about Greg is that none of his life is set up as a joke.
Think about it - how many TV dads have you seen with Greg’s problems, or problems like them? He’s half a Homer Simpson or a Matt Foley. Balding, overweight, washed up musician, runs a car wash, lives in a van. In any other show, those would be the gags about Greg - haha, he’s bald, he’s broke, he’s going nowhere, haha - jokes made at him, not by him. He’d be sidelined as an incompetent, overweight dunce. He’d be comedy relief, not a father figure.
Steven Universe’s writing shines because it doesn’t frame or treat Greg that way. Instead he’s a genuinely great person, chipper and musical. He’s a huge part of his son’s story - supporting Steven even in his own awful living situation, doing everything he can to help the cause, despite being an average joe with no super powers. He’ll crack a self-deprecating line about his poverty or his hairline every now and again, but those are jokes coming from him, fully aware and accepting of how he must appear to the world. Greg’s not dumb, he’s not unaware, and he’s not selfish. He’s not an alcoholic, he’s not a deadbeat. He’s just a big, happy 1980s kid, who’s been through a lot.
He loved his wife. And he loves his son. And he’ll do whatever he can to chip in and help save the world, even if he has to do it from the back of a dirty old fuckin’ van. Would that we could all have dads - be dads - as amazing as Greg.