A gem oc fanfic could also center around a gem who is an outcast among the other gems because of their appearance or the way they act. They feel lonely and misunderstood until they meet Steven, who accepts them for who they are. Together, they work on changing the perception of the other gems towards the oc, and in the process, the oc learns to love themselves.
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.
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.
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 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.
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.
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.
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.
One interesting plot twist could be that a previously thought - to - be - evil gem actually has a noble reason for their actions. For example, a gem who was fighting against the Crystal Gems might be trying to protect a hidden colony of gems that would be in danger if the war ended a certain way.
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.
One idea could be that the OC is a new gem who arrives on Earth and Lapis is initially suspicious but gradually warms up to them as they show their kind nature. For example, the OC might help Lapis with her water powers, like finding new ways to control and shape water in a more creative way.
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.