When their entire relationship is toxic, but they're both so fucked up that it's actually the best case scenario, because subjecting anybody else to either of them would be a human rights violation.
I'm not the first to mention this, but one bit that I thought was really clever in Steven Universe is the ways in which the show subtly justifies the cartoonism of the principle cast always wearing the same outfit for ease-of-animation purposes. The gems are a gimme in that they're all hardlight-projections, and even before that's solidified as a plot point they're otherworldly and superheroic enough that you don't really think to question it. But Steven canonically just owns hundreds and hundreds of those star shirts, which are leftover merchandise from his father's fizzled-out career as a rock star. Into which you can read a whole bunch of other stuff if you really want to, right? And I do want to. It's reflective of Greg's misplaced optimism that he got hundreds of those made in the first place, and it's a benign but visible example of how Steven's life is shaped by the knock-on effects of decisions his parents made before he was even alive. He's got his mother's superpowers and he's wearing his father's shirts.
having talented friends is so wild!!!!!! like. YOU!!!!!!!!!! YOU made THAT. YOU DID THAT?!?!?!?! YOU created!!!! THAT!!!!!!!!!!! WOAH!!!!!! praise!!!!!!!! praise for one thousand years!!!!!!!!!!!!!!!!!!!!!!!