Red Diamond

Red Diamond is a Gem from G-Homeworld in the Steven Universe series. She is the unknown fifth Diamond in the Great Diamond Authority. She was the first born during the Gems' beginning days of origin on E-Homeworld, the homeworld of their creators, the Elements, who are like them, but living sentient matter based on elements of the periodic table, who were in turn created by Matter Councilors, the Outer Gods in charge of matter itself. The Gems were created to appease the Matter Councilors and prove that their creations can't go rogue and keep the laws of a dimension's matter enforced. But ironically, the Gems rebelled and became a rogue race themselves. The Diamonds, Red, Yellow, Blue, and White rebelled on the day Pink Diamond was still in a mobile Kindergarten, which was like an injector. They made G-Homeworld their home. But Red Diamond was more ambitious and intent on making a secret weapon to ensure they become the best race they can be. Through this, she discovered hundreds of planets with organic life, but only one with the potential for sentient life: Earth. Through researching these planets, she found all life on each colony beautiful and one of her magic bullets to fight the Elements. But she also discovered that Gem Fusions weren't limited to the same type, and secretly did experiments to catalog every kind of fusion, and even made Mars the first Fusion colony. But she kept all this a secret from the other Diamonds because their near-death from escaping the Elements have made them wish to never fight the Elements. But it became problematic when Mars' Fusions rebelled without a proper leadership, forcing her to rejuvenate them for their own good. She even made Earth her home base during it's Ordovician Period, when life was starting to bloom rapidly. But thanks to the exploits of Grand Advisor Jerktonium, a representative of ridiculed fictional artificial elements, her secret experiments were leaked, and the Diamonds were corrupted into exiling her to Earth. Angry, Red Diamond returned to Mars after creating a Bismuth to build a ship, and she reduced Mars into it's red desert climate building a Fusion Army to get back at the Elements, regardless if she stood a chance or not. She lasted for a good length before she lost to Jerktonium, and corrupted her, turning her into a monster just like the Corrupted Gems of the series. She has since been a secret bodyguard for him since, and everyone was wiped of memories of her existence, by White Diamond with her abilities, resulting in their perfectionist empire and conquest, bringing in Era 1, and leaving everything beforehand a blank. Red Diamond's fate was ambiguous to everyone who knew her. But she left clues of her past and influence on having Pink Diamond take her place, and later her son Steven Universe. Red is a very ambitious and often vulnerable individual who had an enthusiasm for new things, and would love to push her aims to empower her race so that she could give them a peaceful and everchanging history, knowing more about the glories of Fusions and organic life than Pink ever could in her young days, as she views Pink and the Diamonds as like her own daughters and family.