You could also create a fanfiction where the Black Bird is transported to a different time period. Picture it in a medieval setting, having to adapt to the archaic ways of that era while still trying to fulfill its purpose. This would bring a whole new set of challenges and adventures.
One idea could be that Natsu and Lucy are transported to a world similar to that of Black Bird, where they have to face new and strange magic. They might encounter characters from Black Bird who mistake them for enemies at first. Another plot could involve a powerful dark magic that is affecting both the Fairy Tail world and the Black Bird world, and Natsu and Lucy, with their unique bond, have to find a way to stop it.
One idea could be that a member of the bird family, like a hawk, has special powers and gets recruited by the Avengers. Maybe it can communicate with other birds and use them to gather intelligence.
Blackbirds play an important role in the ecosystem. They help to disperse seeds as they feed on fruits and berries. Also, they are part of the food chain, being prey for some larger birds of prey and mammals.
One idea could be exploring the psychological impact on the characters who bear the Caged Bird Seal. For example, how it affects their self - esteem and relationships with others in the Naruto universe.
Another plot could be that a magical artifact from Harry's world somehow gets mixed up with the Sohma family's curse. Harry has to team up with the Fruits Basket characters to find a way to separate the two and in the process, they all learn valuable lessons about acceptance, friendship, and the power of love. For example, the magical artifact might be amplifying the negative effects of the curse, and only by working together can they stop it.
One idea could be to create a story where characters from different regions in the game form an alliance to take on a powerful and mysterious enemy that has emerged on the island. They have to combine their unique skills and resources to survive this new threat.
One idea could be exploring the backstories of the minor characters. For example, what was the life of that one survivor in the corner store before the apocalypse? Another could be creating an alternate ending where the characters find a safe haven much earlier. And also, a fanfiction about a character's journey to find their lost family during the Black Summer events.
One idea could be exploring the backstories of the cursed children in more detail. For example, you could write about a cursed child's life before she was paired with a promoter. Another idea is to create an alternate ending to the story, where the situation between the Gastrea and humans is resolved in a different way.
Well, you could write a fanfiction about the characters going on a quest to find a long - lost magic spell that could change the balance of power in the Clover Kingdom. Or perhaps a story where the Black Bulls have to team up with their rival squads to fight a common, extremely powerful enemy. You could also explore how the characters would react if the grimoires had minds of their own and could communicate with their owners.
You could write a fanfiction about a mission that goes completely wrong for the Black Order. It could start with high hopes and a well - planned strategy, but then everything falls apart due to unforeseen circumstances like a new and powerful enemy showing up or a betrayal from within. This would add a lot of drama and tension to the story.