Think about their motives. Instead of power and control like the main Diamonds, your OC Diamond could be motivated by knowledge. They might be constantly seeking to understand the secrets of the universe, and this drive could lead them to interact with different characters in the Steven Universe in unexpected ways. They could also be more open - minded and willing to learn from other species, which would make them stand out from the traditional Diamonds.
Start with their appearance. Give them a distinct color scheme that sets them apart from the other Diamonds. For instance, a purple - blue Diamond. Then think about their personality. Maybe they're more introverted and prefer to observe rather than directly control like the other Diamonds.
Consider their backstory. They could have been part of an experiment by the other Diamonds that went wrong, which led to their unique abilities. Their relationship with other Gems can also be a key factor in making them unique. For example, they might have a special bond with a particular type of Gem that is usually overlooked by the Diamonds.
One common theme is self - discovery. The OC often has to figure out who they are in the complex world of the Diamonds. Another theme is friendship, as they usually form bonds with the existing characters.
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.
Start with their appearance. Decide if they have a unique gem placement or color that sets them apart. For example, if they're a new type of gem, maybe their gem is a different shape. Then, think about their personality. Are they shy like Lapis was at first? Or are they outgoing and adventurous? Their backstory is also crucial. Maybe they were created for a special purpose but that purpose was lost over time. This could lead to them having a sense of being lost which Lapis can relate to.
One popular 'Steven Universe Diamond OC Fanfiction' is 'The Diamond's New Ally'. It has an interesting plot where the OC has unique powers that catch the attention of the Diamonds. Another great one is 'A Diamond's Redemption', which focuses on an OC helping a Diamond to change for the better.
You can start by thinking about their backstory. If your OC has a tragic past, like being abandoned by their Gem group, they might be more guarded and cautious. For example, they could be slow to trust others, especially new Gems or humans they meet. Another way is to consider their role. If they're a warrior - type Gem, they could be bold and fearless in battle but a bit clumsy when it comes to expressing emotions outside of combat. You can also give them quirks, like always humming a particular tune when they're nervous or having a fascination with human objects like paper airplanes.
In fanfiction, Black Diamond's story can be used to explore themes like redemption and forgiveness. If she was once a tyrant, her journey towards becoming a better being can be a powerful narrative. It can also show how the other characters in the Steven Universe world react to her change, whether they are skeptical or accepting. This can create interesting character dynamics.
In Steven Universe fanfiction, Black Diamond is often depicted as a very powerful and mysterious character. Some fanfictions might explore her past, her relationship with the other Diamonds, and how she might interact with the main characters like Steven. For example, she could be portrayed as a reformed villain who is trying to make amends for her past actions.
Their relationship could develop in a unique way if Lars starts to learn about Steven's gem heritage more deeply. For instance, Lars could become interested in the history of the gems and start to study it with Steven. This shared interest could bring them closer together.
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.
First, give each character a distinct personality trait. For example, if one of the characters in the harem is a gem, maybe she's overly confident but has a soft heart deep down. For the OC, think about their backstory. If they're from another planet, how does that affect their view of Earth and the gems here? Also, consider their relationships with each other. Do they have inside jokes or shared memories? These things can help develop the characters.