Create interesting character interactions. Maybe have Darth Vader meet Edward Elric and have them have a philosophical debate about power and sacrifice. Also, develop a unique plot. Don't just copy existing storylines. Maybe in an fma and Lord of the Rings crossover, the One Ring has some connection to the Philosopher's Stone and that's the central mystery of the story.
Pay attention to the tone. If you're crossing FMA with a light - hearted anime like One Piece, you might need to find a balance between the more serious tone of FMA and the comical nature of One Piece. And don't forget to proofread and get feedback from other fans to improve your fanfiction.
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.
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.
First, know the characters well. Understand Greed's personality, his desires, and his powers in FMA. Then, research the other fandom you want to crossover with. Next, create a unique and engaging plot that combines elements from both worlds in a seamless way. For example, if it's a crossover with a fantasy world, think about how Greed's alchemical nature would interact with magic. Don't forget to develop good character relationships and let the story flow naturally.
A lesser - known but very creative fma envy crossover fanfiction is the one that combines the world of FMA with a steampunk - themed universe. Envy has to adapt to the new rules and technology in this world, and the story does an excellent job of showing this transformation.
One great fma scar crossover fanfiction could be where Scar teams up with a character from another universe to fight a common enemy. For example, a crossover with a character from Naruto. Scar's unique alchemy skills combined with the ninja's jutsu would make for an exciting plot.
Often, these fanfictions blend the dark and complex world of Fullmetal Alchemist with the idea of 'lust' which could be in terms of a character's desires or a new, alluring force in the story. They might also explore different character relationships and how 'lust' can either strengthen or disrupt them.
There's also 'Homunculus in Another Realm'. In this fanfic, the homunculi are sent to a parallel universe. It has an interesting plot where they interact with new characters and face different challenges than in the original FMA world. The author does a great job of portraying their personalities in this new setting.
I've also heard about 'Lust and the Elric Brothers' Crossover'. This fanfiction delves into how Lust's presence could change the dynamics between Edward and Alphonse Elric. It has some exciting action scenes as well as some emotional moments that are really well - written.
Some fma crossovers involve characters from DC Comics. Picture Batman or Superman in the world of FMA, dealing with the concept of equivalent exchange and the political intrigue in that world. It can lead to some really unique storylines and character interactions.
One common theme is identity. Since the homunculi are in a new crossover world, they often question who they are and their place in this new setting. For example, in many crossovers, they might compare themselves to the new characters they meet.
To write a good one, start with research on Fullmetal Alchemist lore. When it comes to Envy, explore his backstory in the series. For the lemon elements, build up the sexual tension gradually. For example, use meaningful glances and small touches between the characters at first. As for the overall story, create conflict and resolution. Maybe Envy has to overcome his own nature to be with the other character in the fanfiction. This will make the story engaging and the lemon part more meaningful.