One idea could be the fusion of the combat systems. For example, Persona characters could use their Personas in a Fire Emblem - style battle grid. Another plot could involve the characters from both franchises getting trapped in a shared, mysterious realm. They would have to combine their unique skills, like the strategic thinking of Fire Emblem characters and the psychic powers of Persona characters, to find a way out. Maybe there could be a plot where a Fire Emblem character gains the ability to summon a Persona, and they have to learn how to control it while also dealing with the political intrigue and battles in their own world.
A great plot idea is a crossover of the character relationships. Imagine a Fire Emblem lord forming a pact with a Persona user. The two would have to learn from each other's leadership styles. The Persona user could introduce the concept of the Velvet Room to the Fire Emblem world, and the Fire Emblem characters could show the Persona crew how to fight in large - scale battles. It could also be interesting if a Persona villain somehow infiltrates the Fire Emblem universe and starts causing chaos, and the heroes from both worlds have to unite to stop them.
You could have a story where the Persona social links concept is incorporated into the Fire Emblem world. A Fire Emblem character could build relationships with different Persona characters, and as these relationships deepen, they gain new abilities or insights. For instance, a Fire Emblem mage could become friends with a Persona character who specializes in fire - based Personas. Through their bond, the mage could learn new and more powerful fire spells. Or, there could be a plot where the two worlds are on the verge of merging, and the characters must find a way to either prevent it or make the merge a harmonious one.
One idea could be a story that focuses on the backstories of the minor characters. For example, exploring the life of a random student from one of the houses before they entered the academy. It could show their family, their dreams, and how they ended up at the academy.
One idea could be a character reincarnated as a powerful mage in the Fire Emblem world. They could use their modern - day knowledge of strategy to outwit enemies. For example, they might know about concepts like guerrilla warfare and apply it in battles within the game's setting.
One idea could be that Kamui and Camilla go on a secret mission together. During the mission, they face various challenges that force them to rely on each other's skills. This deepens their bond and they start to realize their feelings for each other.
One interesting plot idea could be a story centered around an underdog character in the Fire Emblem universe. This character starts off as a low - ranked soldier but through determination and unique strategic thinking, rises to become a key figure in the war. Another idea is a fanfic that explores the backstory of a minor villain, showing what led them to their evil ways.
An OC could be a half - human, half - dragon in the Fire Emblem Fates universe. They struggle to fit in either among the humans or the dragonkin. Their story could revolve around trying to find a place where they belong while also dealing with the powers that come with their unique heritage and the suspicion of both sides.
A great plot for a Fire Emblem Echoes crossover fanfiction could be a crossover with the Legend of Zelda. Link and Alm could form an unlikely alliance. Alm's army - building skills and Link's solo combat abilities would make for an interesting dynamic. They could be on a quest to retrieve a powerful artifact that has been split into pieces and scattered across both their worlds. Another plot could be a crossover with a superhero universe. The Fire Emblem Echoes characters gain superpowers in this new world. Celica might gain the power of flight, and Alm could have super strength. They would then have to use these new powers to fight against super - villains who are trying to take over their combined worlds. Or, a crossover with a post - apocalyptic world. The Fire Emblem Echoes characters have to survive in a world full of mutants and scarce resources, using their strategic skills to build a new community.
One idea could be exploring an alternate timeline where the main character makes different choices at key moments in the game. For example, siding with a different faction from the start and seeing how the relationships and battles play out.
One idea could be a crossover with another popular RPG like Final Fantasy. Characters from Fire Emblem Fates could find themselves in a world filled with magic crystals and different races from Final Fantasy. They might have to team up with FF characters to fight a common enemy, like a powerful demon that threatens both worlds. Another plot could involve a crossover with a more modern - day setting, such as a post - apocalyptic world. The Fire Emblem Fates characters would have to adapt their combat skills and strategies to this new and harsh environment. They could meet survivors in this world who have different values and beliefs, leading to interesting character interactions.
One idea could be that the characters from RWBY are transported to the world of Fire Emblem. They could join forces with the Fire Emblem characters to fight against a common enemy like a powerful dark dragon. The RWBY characters' unique abilities would add a new dynamic to the battles in the Fire Emblem world.
A possible plot could be that a common soldier in the Fire Emblem army forms a precious love with a healer. Their love story develops as they deal with the hardships of war, such as the loss of comrades and the constant threat of enemy attacks. They find strength in their love and use it to inspire others in the army.