Perhaps an alien OC from a water - based planet. Their physiology is adapted to living in water, but they have the ability to create water - based constructs. They come to Earth in search of a special type of gemstone that is said to have the power to heal their ailing home planet's oceans. This would create a plot full of adventure as they team up with the Crystal Gems to find the gemstone.
You can start by thinking about their home planet's culture. If their planet is highly competitive, the OC might be ambitious and always striving to be the best. For instance, if they're from a planet where music is the most important aspect of society, they could be very melodramatic and express themselves through song and rhythm.
An interesting Steven Universe OC fanfic could focus on an OC who is a healer Gem. This OC could have the power to heal not only physical wounds but also emotional traumas. In the fanfic, they could travel around the universe, helping Gems and humans alike. They might face challenges like being drained of their energy when they heal too many at once, or they could encounter Gems who don't believe in their powers. Maybe they join Steven and the Crystal Gems on their adventures and use their healing skills to mend relationships within the group.
First, come up with a unique OC. Think about their appearance, personality, and backstory. For example, they could be a gem from a far - off planet. Then, decide how they will interact with the existing characters in Steven Universe. Will they be friends with Steven? Or maybe have a rivalry with a Crystal Gem? Next, plan out a plot. It could be about the OC trying to solve a mystery in Beach City or facing a new threat to the world.
One great 'OC Steven Universe Fanfiction' is 'The Gem of a New World'. It has an interesting OC who is a half - gem half - human hybrid like Steven. The story is full of adventure as the OC tries to find their place in the world of gems and humans.
One possible plot could be that the OC is a new arrival in town. Peedee, being the friendly and curious guy he is, decides to show the OC around. They start to bond over their shared love for the local food, which Peedee's family owns a shop for. As they spend more time together, they encounter some of the Gem - related adventures that are common in Steven Universe. And through these experiences, their friendship deepens and they might even face some challenges together that test their relationship.
Well, one aspect could be the unique relationship between Peridot and Steven in the fanfic. Peridot is such an interesting character with her growth and development throughout the series, and when paired with Steven, there can be many new storylines. Maybe it focuses on their friendship deepening into something more, or perhaps it's about them going on adventures together that are different from the main plot of the show.
One idea could be a gem oc who was created with a unique power that the other gems don't understand. For example, the power to communicate with non - sentient objects. This could lead to all sorts of adventures as the oc tries to figure out how to use this power and the other gems try to figure out if it's a threat or a valuable asset.
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.
One idea could be an OC named Ruby - Quartz. She is half Ruby and half Quartz. Her story could start with her feeling out of place among the full - gem characters. She has the fiery passion of a Ruby but the calm stability of a Quartz. As she tries to find her identity, she meets Steven and the Crystal Gems. They help her understand that being a half - gem doesn't make her any less special. She then uses her unique combination of powers to help save the day during a battle against a new Homeworld threat.