One of my other favorite things about this show is, as someone mentioned, the episode where the two young protagonists, Steven and Connie, accidentally fuse. The result is a non-binary entity named Stevonnie whose appearance and pronouns are non-binary, and who spends the entire episode stunning people with their striking body features, height, long hair, and beauty. All of this from a non-binary character with both male and female features.
That was seriously one of the most amazing things I've ever seen, seeing a character with a non-binary appearance being celebrated for their beauty.
And in fact, EVERY character in this show is celebrated for being beautiful and body-positive. The thin waify character is beautiful and elegant, the strong beefy confident leader woman is shown positively, the large motherly overweight character is shown as beautiful and positive, the non-binary character is beautiful, the long-haired balding male character is shown as being cute and desirable. It's just such a positive show without a mean bone in its body, and still manages to have some of the greatest emotional depth and character drama of any cartoon that I've seen.
I'm a huge fan, in case it's not obvious.