White Diamond

White Diamond, or White for short, is the (former) main antagonist of the Cartoon Parody episode, "Change Your Mind".

She is a Homeworld Gem and the leader of the Great Diamond Authority that rules over the Gem race. She holds supreme authority over all Gems, including her fellow Diamonds, and is seen as a being beyond the rest of her kind. For eons, White Diamond remained on the Gem Homeworld, secluded inside her ship, until she finally left Homeworld to help Steven Universe heal the corrupted Gems.

Personality
White is described as being difficult and has a temper that can take a while to cool down: She appeared both calm and understanding during her first meeting with Steven, greeting him (as Pink Diamond) warmly despite his appearance bearing no resemblance to how Pink Diamond actually looked. However, White is curt and dismissive, interrupting Steven whenever he tries to speak to her, and then immediately sends him away to another room without warning as soon as she is done. She treats the entire affair with the Earth, the Rebellion, Pink's faked shattering and absence for the last 6,000 years with a mixture of patronization and nonchalance, remarking it all being simply one of "Pink's games" and asks Steven (as Pink) if he "had fun" and "got it out of [his] system."

According to Yellow Diamond, White never leaves her ship and never lets anyone in a few cases or incidents (such as Pink/Steven's return to Homeworld), so it may be possible that she is a bit reclusive. According to Blue Diamond, she has no sense of humor, being furious with Pink for naming a batch of Pyrite "fool's gold". Despite this, White has a certain soft spot for Pink, joining the other Diamonds in Blue's Pool Chamber to play games such as guessing what song Pink was singing underwater.

It is displayed in "Change Your Mind" that White Diamond is an arrogant perfectionist, making the other gems better by generously "removing their flaws". When she took control of the Crystal Gems, she told Steven that "there is nothing to hinder [her] white light sparkling through them" and saying that they are now "perfect". White Diamond has strict expectations on the way other Gems should behave, causing an immense pressure that Yellow Diamond says could "crack a Gem." She takes this obsession so far that she breaks down after she becomes emotional, going as far as saying emotions are a flaw. This reveals her biggest flaw/fear: atelophobia.

Back to the Homeworld
Steven, the Crystal Gems and the Diamonds travel to Homeworld to ask White for assistance in healing the Corrupted Gems. Before they even arrived at Homeworld, White appeared to already know that they were coming and that "Pink" was still alive because when they do reach the planet, Homeworld is cheering for the return of Pink Diamond.

White controls White Pearl to retrieve Steven, and when she does, White speaks to Steven as if he is Pink. White tells Steven that everyone is so relieved that Pink is alive and that she is relieved that her little game is finally over. White then sends Steven to Pink Diamond's room.

Change Your Mind
When Steven and Connie try to escape Homeworld with the help of Blue and Yellow, White Diamond (speaking through White Pearl) tells them that they aren't going anywhere. She then merges her ship with Pink's. However, both Blue and Yellow Diamond's ships, piloted by Bismuth, Lapis, and Peridot attack her ship and manage to knock it over. Later, Steven, Yellow, and Blue try to convince White to stop her ways and help everybody. White, however, ignores this completely, attacking both Blue and Yellow and turning them into mindless, obedient servants, like her Pearl. White transports Blue and Yellow inside her ship (which merged with hers) and attacks the Crystal Gems. She knocks them off the platform, and Steven drops Garnet, Amethyst, and Pearl's gemstones. While falling, Steven manages to fuse with Amethyst, who then throws him over to Pearl. Steven and Pearl fuse and save Ruby and Sapphire. Steven and Garnet then fuse into Sunstone, but White stomps on them with the leg ship. Sunstone lifts up the foot, however, and attacks the ships. White simply swats them away, and the gems decide they have to fuse into Obsidian. They fuse and attack White, along with Connie, Bismuth, Lapis, and Peridot. They all start destroying the ship, with Obsidian managing to slice off both of the ship's hands. The Gems unfuse after being smashed against a pillar, and they enter White's ship through its eye.

White asks what Steven is doing and asks if he wants his legs and his planet back. Steven asks what White did to the other Diamonds, but White shushes him. She says that both Yellow and Blue are imperfect due to their light, but she is perfect, due to her having every light in the spectrum. She then says that Pink is the part of her that she has to repress. She then suddenly attacks the Gems, turning Amethyst, Garnet, and Pearl into slaves like Blue and Yellow. White says that she removed their flaws and that her white light is sparkling through them. She states that they are brilliant and that the flaws Steven caused them to have are gone, and they are perfect as her. Steven tries to tell her that they are perfect the way they are, but White says that Pink likes to surround herself with inferior gems so she can be the best of the worst.

Steven says that it isn't true and that even if it was, she'd be talking about his mom and not about Steven. White laughs at this and says "your mom" in a mocking tone, but Connie arrives and White makes Pearl attack her. Steven tries to help but White makes Garnet and Amethyst grab him. Pearl disarms and grabs Connie. Steven tells her to let Connie go, but White says that it must feel good to surround himself with lower life forms, blaming everything on someone else. She says that that was why he became Rose in the first place, in order to deceive his friends. Steven disagrees, saying that he isn't Rose, but White points out that he knows things that he couldn't possibly know if he wasn't Pink. Steven says that he was just connecting with her, but White says that even though Pink took the form of Steven, her light is still shining through. She then picks Steven up, saying that it's time to come out. She then removes his gemstone, which appears to reform, but whilst it shows the shapes of both Pink Diamond and Rose Quartz, ultimately the gemstone generates a holographic, seemingly emotionless Steven. When White questions where Pink is, the Gem Steven shouts "She's gone!" with such force that White is forced backward, then walks back towards his human half, which is severely weakened. It appears that neither of the two Stevens is complete without the other one. White and the Gems under her control try to stop the reunion, but Gem Steven creates a featureless, multi-faceted shield which blocks all of White Diamonds' attacks, then "pops", creating a powerful shockwave which forces everyone back.

After Steven and the Gem Steven re-fuse, White Diamond angrily pounds her fists on the floor, stating that Steven should appear as Pink Diamond, that he is not half-human, and that he is acting like a child. Steven retorts that he is a child, and asks what White's excuse is. Her and her slaves' cheeks turn pink, confusing White, and all the gems previously under her control return to normal. Bismuth, Lapis, and Peridot arrive with the intent to fight White but stop upon seeing the state that everyone is in. White asks herself what is happening, and she reaches out to Yellow and Blue. Both of them back away from her, saying that she is "off-colored" after seeing her pink cheeks. White is startled, questioning if she is actually flawed. Steven tells her to let people be who they are and tells her that she can be what she wants to be.

White says that she should know better, and that she should be better, and that she should make everything better. Steven says that she can, but she has to leave her own head. She then travels with Steven and the gems to Earth and witnesses the Off Colors arrive, meeting with the people of Beach City including Steven's father Greg Universe and Lion, and later helps cure all the Corrupted Gems. She then leaves Earth with Yellow and Blue as they go back to Homeworld.