Some characters from Fma would approach the magical creatures with a sense of wonder and a desire to learn. They would try to find alchemical explanations for their abilities. For instance, a character might see a Phoenix and wonder if its ability to be reborn is related to some form of alchemical regeneration. They would also likely compare the magical creatures to the chimeras and other strange creatures they are familiar with in their own world. This would lead to some interesting cultural exchanges between the two universes as they try to understand and interact with the magical creatures.
The simplest way is through character crossovers. Have characters like Harry or Hermione meet and interact with Edward or Alphonse. They could exchange knowledge, with the Fma characters explaining alchemy and the Harry Potter characters sharing about magic spells. Another way is to blend the settings. For example, have Diagon Alley also include alchemical shops selling items like philosopher's stones or transmutation circles.
One idea could be to have characters from Fma use their alchemy skills in the wizarding world of Harry Potter. For example, Edward could try to analyze the magical properties of potions using his knowledge of equivalent exchange. Another idea is a crossover of the villains. Maybe Father from Fma teams up with Voldemort, creating a more complex and dangerous threat for the heroes of both worlds to face. It could also be interesting to see how the Philosopher's Stone and the power of alchemy interact, like if the stone could be used to enhance alchemical processes or vice versa.
One idea could be that characters from Fma use their alchemical skills in the wizarding world of Harry Potter. For example, Edward could try to transmute a magical object using his knowledge of equivalent exchange. Another plot idea might be that the Philosophers Stone from Harry Potter has some connection to the alchemy in Fma, and characters from both universes have to work together to protect it from dark forces. Also, perhaps a character from Fma gets sorted into one of the Hogwarts houses and has to adapt to the magical school life while still having their own alchemical powers.
In a fanfic with this crossover, the interaction of the magic systems would be a central and fascinating aspect. Alchemy in FMA has its own set of rules and limitations, as does magic in Harry Potter. When it comes to the Boggart, the Harry Potter characters rely on their spells and the power of their minds to change the Boggart's form into something humorous. Edward, with his EDS status, could bring in the concept of equivalent exchange. Maybe he could offer something in exchange for the Boggart to leave or change its form in a more permanent way. And the magical energy in the Harry Potter world could interact with Edward's alchemy. It could either disrupt it if they are too different, or it could merge in some ways, allowing for new and creative ways to deal with threats like the Boggart.
In some fanfics, students might start their own magical creature rescue groups. They could rescue injured or abandoned creatures like Bowtruckles. They would then nurse them back to health in a secret location. This not only shows their love for magical creatures but also their determination to protect them, which is a new aspect not fully explored in the original books.
Edward's alchemy skills and Harry's magic could combine in combat. For instance, Edward could transmute the environment to create barriers or platforms, while Harry uses spells to attack over or through these structures. Hermione's knowledge of magic and Edward's knowledge of alchemy could lead to some amazing new discoveries. They could combine their research skills to find solutions to problems that neither world has faced before.
It could work by having Ed teach a unique subject that combines elements of both FMA and Harry Potter. For example, a class on magical alchemy. He would use his knowledge from FMA to introduce different techniques and concepts that the students of Hogwarts have never seen before. His presence would also create some interesting interactions with the existing characters in the Harry Potter universe, like Dumbledore or Snape.
The Yautja would likely see most magical creatures as either prey or a threat. For example, it might see a Hippogriff as a worthy adversary to hunt. But when it comes to something like a house - elf, it might be initially confused as it's not used to such a subservient and small creature. It might also be interested in thestrals since they are associated with death, which could be something the Yautja respects in its own way.
He would likely become more diplomatic. In the Harry Potter series, he was often a fighter, but as an EDS Ambassador in the FMA world, he'd need to talk more. He'd develop better negotiation skills.
One possible fanfic could be 'Ed's Magical Adventure in Hogwarts'. In this, Ed uses his alchemical skills in the wizarding world. He might teach the students about different ways of manipulating matter, which is quite similar to magic in some aspects. For example, he could show how to transform basic elements, just like a transfiguration spell.