Perhaps they could be part of a time - travel adventure. They find a strange device that sends them back in time to when Springfield was first founded. They have to adapt to the old - fashioned ways while also trying to find a way back to their own time. Along the way, they meet the ancestors of the people they know in the present and learn about the history of their town in a very hands - on way.
A plot might involve Bart getting into trouble as usual, but this time Greta is the one who has to bail him out. They then form an unlikely friendship. For example, Bart accidentally destroys something important at a local event that Greta is involved in. Instead of getting him in trouble, she helps him fix it, and from there they start to do other things together, like starting a small business in the neighborhood.
Bart's character could be developed by making him more responsible. In the fanfic, Greta could be the catalyst for this change. She could give him tasks to do that are important, like helping her with a community project. As he does these things, he realizes he can be more than just a troublemaker. Greta, on the other hand, could be developed by showing her flaws. Maybe she's overly perfectionist and Bart helps her see that it's okay to make mistakes.
One idea could be that Bart discovers a hidden intelligence within himself and uses it to outwit the bullies at school. He could start solving complex math problems that even the teachers are amazed by.
One common theme could be the exploration of an unlikely relationship. Since Bart and Greta are two different characters, their relationship in fanfiction might focus on how they overcome their differences. For example, they could come from different backgrounds or have different personalities.
I'm sorry I can't directly provide 'bart x greta fanfiction' stories. However, if you look for fanfiction communities on social media platforms, like Reddit. There are often sub - groups dedicated to sharing and discussing fanfiction. You can ask there if anyone knows of any good 'bart x greta' fanfics. Just be sure to follow the group rules.
Well, one interesting aspect could be the exploration of different relationships between Bart and Lisa. It might show their sibling bond in new and unique ways, like in adventures where they rely on each other more than usual. Maybe it also delves into how they grow and change as characters within the fan - created stories.
One idea could be a story where Bart and Lisa team up to solve a mystery in Springfield. Maybe there's a strange occurrence at the school and they use their unique skills, Bart's street smarts and Lisa's intelligence, to figure it out.
One possible storyline could be Bart getting into trouble at school and Marge having to come to his rescue in an unexpected way. Maybe she uses her motherly wisdom to solve a problem that the school staff couldn't.
One idea could be a story where one of the dalmatian puppies gets lost during a family outing and has to find its way back home, facing various challenges along the way.
One idea could be exploring the backstory of a minor character in the Bioshock universe. For example, a splicer's journey before they became spliced. It could show how they were once an ordinary citizen of Rapture and what led them to make the fateful decision to use ADAM. Another plot could focus on an alternate timeline where the protagonist makes different choices. Maybe they side with the wrong faction and have to deal with the consequences. A third idea is a story centered around a new type of plasmid that has unexpected effects on the user and how it impacts the power dynamics in Rapture.
Another plot could involve the creation of a female monster. In the original, Victor Frankenstein was hesitant to create a female. A fanfic could explore what would happen if he did. Maybe the two monsters would have a complex relationship, and together they would try to find a place in the world that would accept them.