A group of Homeworld Gems who believe that Black Pearl has become too 'contaminated' by her interactions with the Crystal Gems and Steven. They see her as a threat to the traditional Gem order and send a special task force to capture or destroy her, which would make them the main antagonists as they try to stop Black Pearl from living her new life.
Well, in the 'Steven Universe' fandom, it's very likely that there are fanfictions about Steven and Pearl kissing. Since the show has such rich characters and complex relationships, fans are inspired to create their own stories. These fanfictions can range from sweet and innocent interpretations to more complex and thought - provoking ones, but they are all a part of the fans' love for the show.
Maybe Black Pearl discovers a hidden power within herself that is connected to a long - forgotten Gem technology. This power could be something that the other Gems either fear or desire. The fanfiction could explore how she deals with this new - found power and the reactions of the other characters in the Steven Universe world.
Pearl is often very protective. She makes sure Baby Steven is safe from any harm, whether it's from outside threats or just him getting into things he shouldn't. For example, she might gently stop him from touching a dangerous Gem device.
One aspect to consider in Steven Universe Pearl x OC fanfiction is the character dynamics. Pearl is a complex character, and when paired with an original character (OC), it can create interesting interactions. For example, the OC could bring out new sides of Pearl, like her more carefree or humorous side. The fanfiction might explore how their relationship develops over time, starting from initial meetings to deeper emotional bonds. It could also delve into how the OC fits into the existing world of Steven Universe, interacting with other characters and the unique setting.
There could be a plot where Baby Steven gets sick or injured in some way, and Pearl is extremely worried. She tries all her knowledge of Gem healing techniques, but since Steven is half - human, she has to figure out new ways to help him. She might seek advice from Garnet and Amethyst, and in the process, they all bond more closely as a family, with Pearl being especially protective of the baby Steven.
Perhaps a theme of acceptance. Pearl has her own past and way of dealing with things, and Steven is always so open - hearted. A kiss between them in fanfiction could symbolize Pearl accepting a new side of herself or a new type of relationship. Also, the theme of breaking norms as their relationship in the show is more of a friendship/mentorship, and fanfiction can play with changing that dynamic.
A third idea would be to create a story where the Black Pearl has a sentient being inside it. This being could communicate with Steven and the others telepathically. It could be a source of great wisdom or power, but also comes with a dark side that the characters have to deal with. For example, it might try to possess one of the characters in order to achieve its own goals.
There might be a fanfiction where Steven and Pearl go on an adventure to a new planet. In this story, they encounter strange new creatures and have to work together to overcome obstacles. It's a great way to explore their characters outside of the main storyline of the show.
The 'redemption arc' can also be a common trope in Steven Universe Pearl x OC fanfiction. Maybe the OC has a troubled past or made some mistakes, and Pearl helps them to find a new path. This trope allows for a lot of character development and emotional depth. Also, the 'slow - burn' romance trope is popular. Given Pearl's reserved nature, a slow - building relationship between her and the OC can be very engaging, with lots of small, meaningful interactions building up over time.