One interesting concept could be the unique powers and abilities of self - insert original characters (SI OC). For example, an OC might have a special gem - related power that is different from the main characters in Steven Universe. Another concept could be the relationships they form. They might have a complex friendship or rivalry with the existing characters like Steven, Garnet, or Pearl.
Some fanfictions explore the idea of the SI OC bringing in new cultural elements to the Steven Universe setting. Since the show has its own unique culture, an OC could introduce something different, like a new form of art or a different way of communicating. This can lead to interesting interactions with the characters and can also show how diverse the Steven Universe world can be with the addition of new elements through the SI OC.
I really like 'A New Perspective'. In this fanfiction, the self - inserted OC brings a fresh view to the Steven Universe world. It delves into the relationships between the characters in a new way and has some really creative plot twists that keep you hooked from start to finish.
First, study the world of Steven Universe thoroughly. Know the characters, their personalities, and how they interact. Then, create an interesting SI OC with a unique backstory. Make sure the OC's actions and decisions fit within the rules and lore of the SU universe.
One interesting concept is the exploration of different character relationships within the human zoo setting. For example, how the gems interact with the humans they've captured. Another is the potential for human resistance or adaptation in such a strange situation. And there could be the discovery of unique powers or knowledge that the humans gain from being in the zoo.
One interesting concept could be exploring the backstory of Black Diamond. Maybe in fanfiction, it reveals how she came to be so powerful and what her role was in the history of the Gem world.
One interesting concept could be the characters' reactions to each other's unique worlds. For example, the nations from Hetalia experiencing the Gem society in Steven Universe. The different cultures and powers would create a lot of fun interactions.
Well, in 'Steven Universe Harem Fanfic', the concept of friendship expansion can be quite interesting. Since Steven is a very friendly and empathetic character, the harem aspect could be used to show how he draws in various characters who might be initially quite different from him. It can also be about the power of his gem - related abilities being used in new and creative ways within these relationships. For example, his healing powers could have a deeper impact on the emotional states of the characters in the harem.
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.
One interesting story could be about a female OC who has the power to heal the corrupted gems in a unique way. She might use her connection to nature, which is different from Steven's abilities. For example, she can communicate with the plants on the planet to find special herbs that can be used to ease the pain of the corrupted gems during the healing process.