One possible aspect to consider in this fanfiction could be the character development of ED and AL. Their relationship in the original series is very deep and in the fanfiction, it might explore new dimensions of their bond, perhaps in different scenarios or alternate universes.
The fanfiction might introduce new storylines that are not in the original series. It could be something as simple as a day in their lives that was never shown before, or a more complex plot involving new villains or challenges. And seeing how ED and AL react to these new elements is part of the allure.
One plot idea could be that they discover a way to reverse their alchemical transformations through a series of adventures together as a married couple. They might travel to different parts of their world, facing old enemies who now have new motives against them as a united front. Another idea is that they start a school for alchemy, passing on their knowledge while also dealing with the politics of the alchemy world.
Winry would be a great addition. She has a deep connection to Ed and Al, and her skills as a mechanic could play an important role in the story. Another good character is Roy Mustang. His military power and knowledge of alchemy could add a lot of drama. He could be either an ally or an obstacle depending on the plot.
For Ed, being married to Al could make him more empathetic. He's used to being a bit of a lone wolf, but now he has to consider Al's feelings and needs all the time. This could lead to him being more understanding of others as well. Al's personality might develop in a way that he becomes more of a leader. He and Ed are a team, but Al could start taking the lead in certain situations, especially when it comes to diplomatic matters in the alchemical community. Their marriage would be a journey of mutual growth, where they both learn from each other and become better versions of themselves.
One idea could be a story where Ed and Al find a way to reverse their alchemical mistakes in a completely unexpected way. Maybe they encounter a long - lost alchemist who has a unique method. Another plot could be them traveling to a parallel universe where their roles are reversed. For example, Al is the one who is more assertive and Ed is more reserved.
There are many fanfictions where Ed is portrayed as a girl. Fanfiction writers like to play with the existing characters in new ways. By making Ed a girl, they can introduce new themes and perspectives. For example, it could change how the story deals with gender roles in the world of Fullmetal Alchemist. Also, it can create new emotional arcs for the character, as a female Ed might face different challenges and experiences compared to the male version in the original story.
Another interesting one is 'The Married Alchemist'. In this story, Ed's marriage is put to the test when an old enemy resurfaces. It's a more action - packed fanfiction compared to the others. It shows how his marriage has changed him and how he uses his new - found stability to face challenges. The character development in this one is really well - done.
In a fanfiction, perhaps there's a misunderstanding between Ed and Winry. Winry thinks Ed has feelings for another girl because he's been spending a lot of time with a female alchemist. Ed is oblivious to Winry's concerns at first, but when he realizes, he has to find a way to prove to Winry that she's the only one for him.
In a fanfiction, Ed and Winry could go on a journey together. Maybe they're searching for a rare automail part that could enhance Ed's current prosthetic. Along the way, they face many challenges. They rely on each other's skills - Ed's alchemy and Winry's mechanical knowledge. Their relationship deepens during this adventure as they learn more about each other's dreams and fears.