This is an unrelated post made by D'Snowth in another thread, but I thought I'd share it here: Unlike many movie sequels, I think Steven Universe is very good at handling their supporting/side characters. Sure, there's many of them, both gem and human - like the residents of Beach City for example - but they're all unique. They each have their own personalities and traits, and they're not generic cookie-cutter characters created only to occupy space or to be someone's love interest. According to Rebecca Sugar, nearly every character on SU is important in some way. Even Ronaldo is important, because he's the one that foreshadowed the Diamonds at the end of 'Keep Beach City Weird'. Marty is important, too, because when you think about it, if it weren't for him, Greg wouldn't have met Rose, and furthermore, Steven wouldn't have been born. On a side note, Rebecca once stated that each character has appeared/will appear more than once, which means that the Zircons and the Off Colors will most likely be back sometime in Season 5.