Another great thing is the different storylines that might not be fully covered in the anime or manga. These side stories can add more layers to the overall narrative. They could show different perspectives of events or introduce new characters that interact with the main cast in unique ways.
One interesting aspect is the exploration of different character relationships. Fanfiction often delves deeper into the bonds between the Elric brothers, for example, showing their growth and how they support each other in new and unique situations. Another aspect could be the alternative storylines. Some fanfictions might rewrite key events in the anime, like the Promised Day, which can offer a fresh perspective on the overall plot and the characters' motives.
One interesting fanfiction could be where characters from Naruto and Fullmetal Alchemist are brought together in a new world. For example, Naruto characters might find themselves in Amestris and have to deal with the alchemy laws there. They could team up with the Elric brothers to fight a common enemy that threatens both their worlds.
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?
Mustang's right - hand man, Riza Hawkeye, is quite interesting. Her loyalty to Mustang, her sharpshooting skills, and her own moral code make her a great character. Father, as the main antagonist, is a very interesting figure. His grand plan for the world, his manipulation of others, and his mysterious origin all contribute to his allure. And May Chang, with her small size but big heart, her unique alchemy, and her connection to the Xingese alchemic traditions, is also one of the more interesting characters in the 'Fullmetal Alchemist Light Novel'.
One interesting fanfiction could be about Harry Potter somehow ending up in the Fullmetal Alchemist world and learning alchemy. He might use his magic in combination with alchemy in unique ways to solve problems.
One interesting concept could be the combination of different alchemical abilities from various characters in different universes. For example, if a character from another anime with a unique power system crosses over into the Fullmetal Alchemist world, it could lead to new alchemical reactions and techniques. Another concept might be the exploration of how different cultures and moral codes interact. Characters from different fictional worlds might have different views on equivalent exchange, which could create some really thought - provoking scenarios. Also, the idea of crossovers can introduce new relationships between characters. Characters who have never met before might form alliances or rivalries based on their own goals and personalities.
Fanfictions that involve crossovers can also be interesting. For example, a crossover between Fullmetal Alchemist and another popular anime like Naruto. It could be a story where the characters from both series have to work together to solve a common problem, like a new type of threat that combines the elements of chakra and alchemy.
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.
A crossover could involve the Homunculi from Fullmetal Alchemist being a threat that the Avengers have to face. The Avengers would be challenged by their unique abilities and the complex nature of the Homunculi. The alchemists might then team up with the Avengers, sharing their knowledge of the Philosopher's Stone and its power, which could be crucial in fighting the Homunculi.
There could be a fanfiction where 'the watch' is a key element in a mystery. For example, the watch is found at a crime scene in Amestris. The Elric brothers then get involved in solving the mystery behind the watch, which could lead them to discover a new form of alchemy or a secret organization. In this fanfiction, the watch might have symbols on it that are related to ancient alchemical knowledge.