One idea could be a crossover where a character from Naruto, like Sakura, somehow ends up in the world of Fullmetal Alchemist. She meets Edward and they initially clash due to their different ways of handling things. But as they work together to solve a mystery that ties both their worlds, they start to develop feelings for each other. Maybe it's about a powerful alchemical object that has the power to disrupt the balance in both universes, and Sakura's medical ninjutsu and Edward's alchemy skills are needed to stop it.
A fanfiction could revolve around Naruto himself being transported to the Fullmetal Alchemist world. He befriends Alphonse first, and through him, meets Winry. Winry is intrigued by Naruto's positive attitude and his never - give - up spirit. Meanwhile, Naruto is fascinated by the concept of alchemy. As he helps the Elric brothers in their search for the Philosopher's Stone, a romance could blossom between him and Winry. They could learn from each other's cultures and values, which deepens their connection.
Perhaps a story where an alchemist from the Fullmetal Alchemist world ends up in Konoha. This alchemist, say Roy Mustang, catches the eye of Hinata. Roy is initially confused by the ninja way but is impressed by Hinata's determination. Hinata, on the other hand, is drawn to Roy's charisma and his powerful alchemy. They start to work together on a project to protect Konoha from a new threat, and during this time, their relationship turns romantic. Roy could use his alchemy to create new defenses for the village, while Hinata uses her Byakugan to help him understand the layout of the area better.
Imagine a scenario where Naruto and Edward Elric switch bodies. At first, they are both frustrated and confused, but as they try to adapt to each other's lives, they also start to understand each other on a deeper level. Edward, in Naruto's body, meets Hinata and is touched by her kindness. Meanwhile, Naruto, in Edward's body, gets to know Winry better. Through this body - swap experience, two romantic relationships could develop - one between Edward (in Naruto's body) and Hinata, and another between Naruto (in Edward's body) and Winry.
There probably are. Fanfiction writers often love to mash up different universes. In such a fanfic, Naruto could bring his chakra - based powers and blend them with the principles of alchemy from Fullmetal Alchemist. Maybe he'd use his Rasengan in a new way by incorporating alchemical transmutation circles. It would be a wild and creative concept.
One idea could be a crossover where Naruto's chakra system somehow gets intertwined with Alchemy. For example, Naruto could learn to transmute his chakra into different elements in a more alchemical way rather than just using ninjutsu. Another could be that characters from both universes meet in a strange in - between dimension. Maybe Sasuke and Edward Elric could have an intense battle or a deep conversation about their quests for power and revenge. And perhaps Hinata could learn some alchemical self - defense techniques from Winry Rockbell.
There's a fanfic called 'Alchemy in the Land of Fire'. It focuses on a character who is a master of alchemy but is on the run from his own world in Fullmetal Alchemist. He ends up in the Land of Fire in Naruto. The story is full of action as he has to fight against some of the rogue ninjas using his alchemical powers. He also teams up with some of the well - known Naruto characters like Kakashi and they go on adventures together, trying to uncover the mystery of his sudden appearance in the Naruto world.
Another idea might be alternative endings. Fanfiction often plays with the concept of 'what if' things had gone differently. Maybe if Edward had not been able to regain his brother's body, how would he have coped and what new path would his life take?
Maybe Edward dies in a fight against a powerful new enemy. This enemy could be someone who has mastered a dark form of alchemy that Edward couldn't counter. His death could then inspire the other characters, like Winry, to take up arms in a different way. She might use her skills as an automail engineer to create weapons that can defeat this new threat, all while mourning Edward and vowing to make his death count.
A good Fullmetal Alchemist and Naruto fanfiction often has a well - thought - out plot that combines the elements of both universes in a seamless way. For example, it could be about how the laws of alchemy work in the world of ninjas. Also, good character development is key. If it shows the characters from both series growing and changing as a result of their interactions, it's great. Like if Naruto learns about the concept of equivalent exchange from Fullmetal Alchemist and it changes his view on his ninja training.
One idea could be exploring Lust's backstory before she became a Homunculus. Maybe she had a human life before and what led to her transformation. Another could be a fanfiction where Lust forms an unlikely alliance with a human alchemist. They could work together to achieve a common goal, like saving a town from a greater evil.
The plot could involve the OC being a alchemist on a quest for a powerful alchemy item. Greed, sensing an opportunity for himself, joins the OC. Along the way, they encounter various enemies and obstacles. For instance, they might have to face off against other homunculi who don't want Greed interfering in their plans. The relationship between Greed and the OC could start off as a simple partnership but evolve into a deep friendship or more as they rely on each other to survive.
One idea could be an OC who is a foreign alchemist with a unique form of alchemy based on their homeland's culture. For example, an alchemist from a desert region who uses sand-based alchemy. Another could be an OC that has a special connection to the Homunculi, not as an enemy but as someone trying to understand and redeem them. Maybe an OC that was experimented on by the same people who created the Homunculi and has some shared traits.