The 7 levels of Steven Universe villains (Part 1)
Level 1 - Scum
They're just egotists. They're one dimensional through and through. They have no strategy. No grand plan. Just evil for the sake of it. And not evil, really. Just jerks. Sure, they may pose a nuisance to the protagonist, but no matter how "scary" or "intimidating" they view them, the only interesting thing about them is often than not, "They were mean to them." That is literally all the villain in them.
Kevin
Arguably the worst villain in the franchise. Kevin is often than not your typical social climber. His whole existence is to serve as an obstacle for Steven and Connie. But at every turn, he fails miserably. He loses a race to two 14 year olds fused together. And when Steven repairs his relationship with Connie, he's then dumped in his own pool in front of the friends he invited for his party.
Emerald
A high ranking government official serving not one, but TWO diamonds is sure enough to earn her a higher spot. But her motivation boiled down to "My ship was stolen by Pirates". It's here you realize how pathetic Emerald really is. It's not entirely her fault though. If Cartoon Network didn't cut production, then maybe she would have been a more fleshed out and memorable character.
Squaridot
You'd think that she'd be a direct parallel to Peridot’s character growth. But whenever she gets belittled, you realize she's no different. Every insult thrown by Peridot fills this gem with Pure rage. But Unleash the Light showed us that not every egotist is insufferable and with no motive at all. Once Steven convinces her to open up, she finally starts to reflect on her life.