Well, perhaps there could be a plot where Greg is somehow transported to the Gem homeworld. Blue Diamond finds him there and is initially hostile as he is a human. But as Greg shows his gentle and creative side, Blue Diamond's perception of him changes. They could then embark on a journey across the Gem homeworld together, with Greg introducing Blue Diamond to human concepts like family and love in a more in - depth way, and Blue Diamond protecting Greg from the perils of her world. This journey would strengthen their relationship and lead to a unique form of connection between them.
A possible plot could involve a mystery surrounding an ancient power that only Blue Diamond and Pink Diamond together can unlock. It could start with strange events occurring in their realms that seem to be connected to this power. Also, a plot about them swapping places for a day and learning about each other's responsibilities and the challenges they face would be interesting. There could also be a story where they discover a hidden prophecy that involves their fates being intertwined in a way they never expected.
One idea could be a story where Blue Diamond and Yellow Diamond have to team up to face a new threat from a far - off galaxy. They put aside their differences and combine their powers in unique ways.
The main characters are obviously Greg and Blue Diamond. Greg is a human, a musician, and Steven's father. He has a laid - back and kind personality. Blue Diamond, on the other hand, is a powerful Gem with a complex personality. She is regal, often seen as cold, but has her own depths of emotion.
One idea could be that Steven tries to understand Blue Diamond's past traumas and helps her heal. Maybe he uses his unique powers of empathy to break through her cold exterior.
Another plot could be centered around Pearl teaching Greg some Gem - related skills, like how to use a Gem weapon or understand Gem technology. As they spend time together during these lessons, their relationship deepens, and they have to face the challenges that come with a relationship between a human and a Gem.
Perhaps the Diamond Girl gets trapped in a glitchy part of the game. This part of the game has distorted landscapes and strange creatures. She has to find a way to escape while also trying to figure out what caused the glitch in the first place. She might need to use her knowledge of the game's code, if she has any, to get out.
One idea could be exploring an alternate universe where the main characters have different Pokemon partners. For example, instead of Dawn having Piplup as her starter, she could start with a Chimchar. Another plot could revolve around a mysterious new Pokemon that only appears in a long - forgotten part of the Sinnoh region. It could be a Pokemon with unique powers that both the good and bad guys are after. Also, a story about a trainer who travels through Sinnoh backwards, starting from the Pokemon League and working their way to the beginning of their journey, facing challenges in reverse order.
One idea could be a story where Peridot tries to prove her worth to Yellow Diamond in a non - traditional way. Maybe she discovers a new form of energy on Earth that could benefit the Diamond Authority, and she has to convince Yellow Diamond to give her a chance to explore it further.
A plot could revolve around a trainer who gets lost in a mysterious part of Sinnoh that is not on any regular map. In this area, they encounter Pokemon with strange behaviors and new evolutionary forms. The trainer has to figure out how to get back home while also learning about these new Pokemon, perhaps with the help of some local characters who have their own secrets.
You can try looking on fanfic websites like Archive of Our Own (AO3). It has a large collection of fan - created works, and there's a good chance you'll find some 'greg x blue diamond fanfic' there.