In this fanfiction, the plot could center around Edward trying to understand and control a mysterious new type of energy. He could be on a quest to find the source of this energy. Along the way, he meets new characters, some of whom help him while others try to stop him from achieving his goal of mastering this energy.
It could be another alchemist who wants to use this new energy for evil purposes. This alchemist might see Edward as a threat to his plans and constantly try to stop him from learning more about the energy.
One possible plot could be that Edward Elric discovers Ki as a new form of energy. He might initially struggle to understand and control it, like he did with alchemy. He could meet a mentor who teaches him the basics of Ki, and then he uses this new knowledge to face his enemies in a different way, perhaps even combining Ki with his alchemy skills.
There could be an organization that wants to keep Ki a secret from the world of alchemy. They see Edward's attempts to learn Ki and potentially bridge the gap between the two as a danger. So, the leaders of this organization send their agents to stop Edward, and the most powerful of these agents could be the main antagonist in the fanfiction.
Yes, there are likely fanfictions out there with such a concept. The worlds of Naruto and Fullmetal Alchemist, where Edward Elric comes from, are quite different, but that's what makes the idea of a crossover in fanfiction so interesting. Writers might explore how Naruto's ninja world and its unique powers could interact with Edward's alchemical abilities and the complex world of Amestris.
Alphonse Elric is often present. He might play a role in helping Edward understand and use his new gamer - like abilities in relation to alchemy. For example, he could be the one who discovers a new aspect of Edward's powers.
Edward might meet his parents. Since he has the chance to go back in time, he could meet them when they were alive and perhaps learn more about alchemy from them, which could change his future actions.
In fanfiction, the possibilities are nearly endless. Regarding Edward Elric becoming a homunculus, it could be a very interesting concept. If he were to become one, it would completely change his relationship with other characters. For example, his brother Alphonse might react in a very different way. Also, Edward's own view of himself and his abilities would be transformed. His struggle with his new form, if it were to happen, could be a central theme in the fanfiction. Maybe he would try to find a way to reverse the process, or perhaps he would embrace his new existence as a homunculus. It all depends on the creativity of the fanfiction author.
There are many ways to approach an emotionless Edward Elric in fanfiction. Some writers might focus on how he still manages to be a brilliant alchemist without the ability to feel. Others might explore the internal struggle within him as he tries to understand what has been taken from him. It really depends on the writer's creativity and the direction they want to take the story.
One great 'Edward and Alphonse Elric Fanfiction' is 'The Brothers' Bond'. It really delves deep into their relationship, showing how they support each other through various challenges. Another interesting one is 'Alchemy's Sons'. It explores their journey in a different light, adding new elements to their story.