Watermelon Stevens

The "Watermelon Stevens" are characters who appear in "Watermelon Steven", and are the episode's main antagonists. They appear again in "Super Watermelon Island".

Appearance
The Watermelon Stevens are all Steven-shaped humanoid watermelons. They have bumps on their heads resembling Steven's hair and are close to Steven's height. They each have two black seeds for eyes and dark and medium green stripes running vertically down their bodies.

In "Super Watermelon Island", one Watermelon Steven has a mouth. It has a yellow star painted on its chest, resembling the star seen on Steven's T-shirts. It is also wearing a flower crown.

About
The Watermelon Stevens were brought to life by Steven, who, without knowing he inherited Rose Quartz's phytokinesis ability, started spitting watermelon seeds outside of It's A Wash. Steven's saliva caused the discarded seeds to develop into fully-formed sentient watermelons by the next day.

Rose's plants acted as her guardians, and similarly the Watermelon Stevens defend Steven from harm. Though initially docile, the Watermelon Stevens become increasingly aggressive towards any possible "threats" to Steven, regardless of Steven's commands and/or the lack of any real danger.

"Watermelon Steven"
After their formation, the Watermelon Stevens initially appeared to be inanimate. Steven takes a liking to one of the smaller looking melons, calling it Baby Melon. Steven displayed them in Beach City Funland intending to give them away, but Sadie insists on paying five dollars for one and Ronaldo draws attention to the sale, resulting in Steven selling all his Watermelon Stevens, except for Baby Melon which was not for sale.

Onion steals Baby Melon for himself, and as Steven gives chase Baby Melon suddenly moves, escaping Onion and reuniting with Steven. Realizing that all the other Watermelon Stevens must be alive, Steven recalls them, refunding his customers and taking back the Watermelons, who follow him. Ronaldo refuses to return a Watermelon and hits Steven with a spatula, which provokes an aggressive response from the Watermelons, who all start punching and kicking Ronaldo.

Steven returns to the Beach House to inform the other gems of the crisis. The gems accidentally provoke the Watermelons by pushing Steven back inside the house, and they fight. The gems destroy many Watermelons before the Watermelons hold them down by sheer numbers. Some Watermelons dig a hole in the ground for Amethyst, intending to mercilessly bury her with a bouquet of flowers.

Due to his lack of control over this new power, Steven cannot prevent the Watermelons Stevens' rampage. This inspires Baby Melon to sacrifice himself by punching Steven, diverting the Watermelon Stevens' attention away from the Crystal Gems, whom they were previously attacking. Upset, Steven tells them to go and not come back until they understand Baby Melon's sacrifice, and they comply. They were last seen walking deep into the ocean or along the beach, with some getting picked up by seagulls.

"Super Watermelon Island"
Little is known about this besides the fact that they are set to appear in this episode.

Steven
The Watermelon Stevens protect Steven when he is faced with any potential danger.

Ronaldo
Ronaldo buys a Watermelon Steven and decides to live-stream an autopsy of it for the website Weirdstar. Realizing that they are alive, Steven tries to stop Ronaldo and is hit with a spatula. This causes the Watermelon Stevens to react and attack Ronaldo.

Baby Melon
Baby Melon saves Steven and the Gems from the other Watermelon Stevens by sacrificing itself. It strikes Steven, sending the wrath of the other "Watermelon Stevens" upon itself.

Malachite
During "Super Watermelon Island", one of the Watermelon Stevens comes face-to-face with Malachite.

Trivia

 * It seems the Watermelon Stevens have no mercy, since they held down Amethyst and started digging a hole to dump her in. They may have even filled the hole back in with her still in it. The only mercy that was shown was when they got some flowers for Amethyst when they were about to bury her, which she comments are lovely.
 * Despite the fact that watermelons float, the Watermelon Stevens sink.
 * When Watermelon Stevens are destroyed, they explode into chunks and slices of cut watermelon.
 * In Super Watermelon Island, it seems the Watermelon Stevens worship Malachite as their deity shown when one Watermelon Steven was praising the monster after she rose from the ocean.