One great 'Fullmetal Alchemist Scar Crossover Fanfic' is 'Scar's New Path'. It takes Scar on an adventure where he teams up with characters from another universe. The story is really engaging as it delves into Scar's character development in this new and strange setting.
A good 'Fullmetal Alchemist Scar Crossover Fanfic' should first of all stay true to Scar's character. His backstory, his beliefs and his unique abilities should be respected. For example, if he's made to be too out - of - character, like suddenly being overly friendly without a proper reason, it won't feel right.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can search specifically for Fullmetal Alchemist Scar crossovers. Just use the search bar and type in relevant keywords. Another option is FanFiction.net, which also has a wide range of fan - created stories.
One plot idea could be Scar crossing over into a world where alchemy doesn't exist, and he has to adapt to a completely different form of combat and magic. Another is a crossover with a modern - day world, and Scar has to deal with modern technology and society while still holding onto his beliefs.
One interesting fanfic could be where the alchemist characters find themselves in the wizarding world of Harry Potter. They might use their alchemy skills in Hogwarts, which could create some really unique scenarios. For example, Edward Elric could try to analyze the magical properties of potions using his alchemical knowledge.
To create a compelling Bradley in a crossover, you need to keep his core characteristics. His sense of duty and his military leadership skills should be emphasized. For example, if he crosses into a world of pirates, he could use his leadership to organize the pirates into a more efficient crew.
One idea could be to have Bradley cross over into a modern - day world. He'd be out of his element, dealing with things like technology and modern social norms. It could be funny to see his reaction to things like cell phones or cars.
A common theme is the clash of different power systems. Alchemy and magic are very different, and seeing how the characters from each world react to the other's power source is interesting. For instance, wizards might be amazed at the physical transformations possible through alchemy.
One idea could be that Naruto characters somehow end up in the world of Fullmetal Alchemist. Maybe Naruto and Sasuke are chasing after a rogue ninja who uses some strange alchemy - like jutsu to open a portal to the other world. There, they have to learn about alchemy to find their way back home and in the process, they meet the Elric brothers and team up to fight against common enemies, like homunculi who are interested in the power of chakra.
One good fanfiction could be 'The Unlikely Alliance'. In this, Edward and Scar start off as enemies but are forced to work together due to a common threat. It shows their growing understanding of each other's motives. Another is 'Redemption and Reconciliation' which delves into Scar's past and how Edward comes to terms with it. There's also 'A New Path' where they journey together to find a way to reverse the damage of alchemy in their world.