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.
A cool OC for a Steven Universe fanfic could be a Gem who was once a part of Pink Diamond's court but has been in hiding for a long time. This OC could have secrets about Pink Diamond's past that no one else knows. They might be hesitant to reveal themselves because they fear the reaction of the other Gems. In the fanfic, their journey could be about coming to terms with their past, deciding whether to share their secrets, and finding their place among the new world order of Gems and humans that Steven has helped to create.
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.
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.
Another idea is a human OC who is a detective in Beach City. They start to notice strange happenings that are related to Gem activity. As they dig deeper, they get involved with the Crystal Gems and become an ally. They could use their detective skills to help the Gems solve mysteries, like finding missing Gem shards or uncovering the secrets of an ancient Gem structure.
A more emotional plot could be an OC who was once part of the Homeworld gems but defected. They have a lot of guilt and self - doubt because of their past actions. In the fanfiction, they try to make amends by helping the Crystal Gems. But they constantly fear that their old allies will come after them. This internal struggle and their journey of redemption could be a really interesting story.
Maybe the giant OC is a guardian of a long - lost power. The story could revolve around Steven and the gang trying to figure out how to communicate with this giant, who seems to be protecting something important. It could lead to adventures where they have to learn the giant's language and culture, which is very different from their own.
One idea could be an OC Diamond who has different powers compared to the known Diamonds. For example, the ability to control time in a limited way. This could create interesting storylines where the OC Diamond tries to fix past mistakes within the Steven Universe world.
Well, the OC could be a human - gem hybrid. This would make them an outcast in both human and gem society at first. But as the story progresses, some of the main characters like Pearl, Amethyst, and Peridot start to form a bond with the OC. Maybe they are all intrigued by the OC's dual nature and the way they navigate between the two worlds. This could lead to a harem - like situation where they all have different relationships with the OC, some more platonic, some with a hint of romance.
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.
One idea could be a story where Steven, despite being blind, discovers a new power within himself that is related to his sense of touch. For example, he can sense the emotions of the Gems through their gemstones when he touches them. This would add a new dimension to his relationships with the other characters.
A plot could involve a half - gem OC who is half Emerald and half Peridot. The OC is discovered by a group of rogue gems who want to use her unique powers for their own gain. She has to escape from them and find her way to the Crystal Gems. Along the way, she discovers that she has the ability to create energy shields like an Emerald and hack into technology like a Peridot. Another idea is a half - gem OC half Topaz and half Bismuth. She is born during a time of peace but when a new war breaks out between Homeworld and the Crystal Gems, she has to decide which side to fight for, as she has qualities from both sides.