One idea could be to have the characters from both games meet in a mysterious in - between world. Maybe the protagonists from each game team up to fight a new, powerful threat that is causing chaos across both their realms. For example, the Avatar from Fates and Robin from Awakening could combine their strategic skills to lead their combined forces.
Corrin and Robin would be a great pairing. Corrin has their dragon powers and a somewhat naive view of the world in the beginning, while Robin is a brilliant tactician. They could learn a lot from each other. Robin could teach Corrin about more complex battle strategies, and Corrin could show Robin the value of empathy in leadership.
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 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 idea could be Percy going on a quest that was pre - ordained by the Fates. He discovers that his every move is part of a larger plan they have for the demigod world. For example, he might be sent to retrieve an ancient artifact that holds the key to maintaining the balance between the gods and the Titans, and along the way, he has to face challenges that test his loyalty to the Fates' plan.
Well, perhaps a plot where Percy discovers that being married to the Fates gives him the ability to see snippets of the future, but it's all jumbled up. He then has to work with the Fates to figure out how to use this new power properly. Also, there could be a story line where other gods are jealous of Percy's connection to the Fates through marriage and try to undermine him.
One idea could be a character awakening a new and unique jutsu. For example, Naruto could awaken a jutsu that combines the power of all the tailed beasts in a completely unexpected way. This could lead to new battles and challenges as the villains try to either stop him or steal this power for themselves.
Perhaps in this fanfiction, Naruto discovers a hidden ability that was passed down from Kushina. They go on a journey together to learn more about this power and how to control it. This would involve a lot of training sessions and some heart - to - heart conversations between mother and son.
One idea could be that Naruto and Hinata end up in an alternate universe where their roles are reversed. Hinata is the loud and confident one, while Naruto is more shy. Another could be a time - travel plot where they go back in time and have to work together to change an important event in the ninja world. They might also find themselves in a world where all the ninja clans have different powers, and they must combine their skills to survive.
One idea could be that Ichigo and Rukia find themselves in an alternate universe where their roles are reversed. Rukia could be the one with the Shinigami powers from the start in Karakura Town, and Ichigo is a normal human who gradually discovers his own latent spiritual abilities to help her. Another could be that they are sent on a special mission together to a realm neither has been to before, like a dimension full of lost souls. There, they have to rely on each other more than ever to find their way back and complete their task.
One idea could be that Naruto and Ichigo meet in a dimension where their powers are combined. They have to fight a new, powerful enemy that threatens both their worlds. For example, a villain who can manipulate the energy of chakra and reiatsu at the same time.