For the FMA characters in the OHSHC world, you can show how they adapt to the new social norms. Edward, for instance, might initially be frustrated with the elaborate social games in OHSHC but gradually learn to play along. You can also focus on how their goals change. Maybe they start off trying to find a way back to their own world but then become invested in the problems of the OHSHC characters. For the OHSHC characters in the FMA world, their charm could be used in different ways. Tamaki could try to use his charm to negotiate with the military in FMA.
In a 'fma ohshc crossover fanfic', character development can also come from facing new challenges. The FMA characters are used to the life - and - death struggles in their own world. When they are in the OHSHC world, they face challenges like dealing with high - society drama and the insecurities of the host club members. Similarly, the OHSHC characters in the FMA world have to face the harsh reality of war, alchemy, and the existence of homunculi. This forces them to grow and change, and it also shows new sides of their personalities that might not have been explored in their original universes.
One idea could be to have the characters from 'Fullmetal Alchemist' (FMA) end up in the 'Ouran High School Host Club' (OHSHC) universe. For example, Edward and Alphonse could enroll in Ouran High School. Edward's short temper and Alphonse's gentle nature would create interesting interactions with the host club members. They could get involved in the club's activities, like the commoner's day event, and bring their alchemical knowledge into this new world.
To write a good fma crossover fanfic, start by choosing the right crossover. It should be something that has potential for interesting interactions. For instance, if it's an FMA and Bleach crossover, think about how alchemy and soul reaper powers could interact. Research both fandoms thoroughly. Look at their cultures, technologies, and power systems. When writing the story, focus on the emotions of the characters. Show how they react to this new and strange crossover world. Use vivid descriptions to bring both universes to life in the fanfic. And don't forget to proofread and get feedback from other fans.
For the RVB characters in the RWBY world, you can have them develop new skills related to Aura and Semblances. For example, Tucker could discover his Semblance is something like enhanced swordsmanship. And they could also develop in terms of their understanding of the RWBY universe's values.
With Jack Frost, his character can be developed by showing his reaction to the dragons. He might be fascinated by them at first but also a bit scared. His relationship with Toothless could be a key part. Maybe Toothless doesn't trust him immediately, and Jack has to earn that trust. This would show his determination and his ability to connect with different beings.
For Minato, you can focus on how he adapts to the new crossover world. His reactions, thoughts, and how he modifies his use of Personas based on the new challenges. For other crossover characters, study their original personalities and find ways to make them interact realistically with Minato. For example, if it's a crossover with a detective character, they might be initially suspicious of Minato's powers.
For the characters in a 'natsu harem crossover fanfic', first, study the original personalities of the characters from their respective universes. For Natsu, his loyalty and his love for food are key traits. Then, when introducing new characters from other universes into the harem, think about how they would react to Natsu. For example, if a cold and calculating character from a detective - themed anime enters the harem, their initial clashes with Natsu's impulsive nature can be a great source of character development.
A really interesting fma crossover fanfic idea might be with the world of Fullmetal Alchemist and the Lord of the Rings. Imagine the Elric brothers in Middle - earth, facing the challenges there. They could use their alchemy skills in a world filled with magic, elves, and orcs. It would be a very unique combination as the concepts of alchemy and the magic in Middle - earth are quite different.
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.
In a Naruto Kakashi crossover fanfiction, to develop Kakashi's character, you could introduce a new love interest for him from the crossover world. This would make him open up more emotionally and show a different side of him. As for Naruto, put him in a situation where he has to teach Kakashi something. Maybe in a world where Naruto's positive attitude is the key to solving a problem that Kakashi can't figure out. This would not only show Naruto's growth but also make their relationship more equal, and both characters would be developed in new and interesting ways.
First, know both universes well. For an fma crossover, you need to understand the rules of alchemy in FMA and the characteristics of the other universe you're crossing it with. For example, if it's a Star Wars crossover, know about the Force and lightsabers as well as alchemy.