One challenge is combining the two very different worlds. Naruto has ninjas with chakra and unique jutsu, while Fire Emblem has its own system of magic, classes, and medieval - like settings. It's hard to make them blend seamlessly.
Keeping the essence of both series intact is also a struggle. Fans of Naruto and Fire Emblem have certain expectations about the characters, their personalities, and the overall feel of the series. The writer has to meet those expectations while still creating a new and engaging story in the fanfiction.
One challenge is getting the characterizations right. Naruto characters have very distinct personalities, and so do those from Fire Emblem Fates. You need to make sure that when they interact, it feels natural. For example, Naruto's boisterous and optimistic nature might clash or mesh in interesting ways with the more formal or stoic characters from Fire Emblem Fates.
Character integration can be tough. There are so many characters in both franchises, each with their own personalities, backstories, and abilities. Deciding which characters to include and how to make them interact organically is a big hurdle. Also, the tone of the two series is different. Persona can be quite dark and psychological at times, while Fire Emblem has a more heroic and epic tone.
One challenge could be the lack of modern conveniences. In the Fire Emblem world, there are no smartphones or modern plumbing. A modern person would have to adapt to a more primitive lifestyle. Another challenge is the different social norms. For instance, the strict class systems in Fire Emblem might be hard for a modern person to understand and abide by.
First, you need to decide on the main character. Will it be a Naruto character in the Fire Emblem world or vice versa? Then, think about the personalities of the characters you want in the harem. After that, create a basic plot. It could be about saving a world, or finding a powerful artifact. And don't forget to do some research on both Naruto and Fire Emblem universes to make the story more accurate.
A good fanfiction could involve a plot where Female Corrin and Camilla are separated from their allies. They have to find their way back while also dealing with their own personal issues. For instance, Corrin might be doubting her abilities, and Camilla could be struggling with her over - protectiveness. This would add depth to their characters as they grow throughout the story.
They might face opposition from their respective groups. Robin's human allies may be wary of Nowi because she is a dragon, and Nowi's dragon kin may not trust Robin, a human tactician. They would have to work hard to prove that their relationship is beneficial to both sides.
One way could be Naruto's ninjutsu skills being translated into unique combat arts. For example, his Shadow Clone Jutsu could be a special ability that creates temporary clones to distract enemies in battle, similar to how some Fire Emblem characters have skills to create decoys.
In some 'Naruto Fire Emblem fanfiction', the plot might revolve around a love story between a character from Naruto and one from Fire Emblem. For instance, a Fire Emblem princess falling in love with Naruto because of his unwavering spirit. Their relationship could then be a catalyst for bringing the two worlds closer together, with both sides having to overcome cultural differences and prejudices to accept their union.
The idea of power and its limits is also common. In Naruto, there are different levels of power like different levels of chakra control. In Fire Emblem Fates, there are strong and weak units. Fanfictions might explore how a character's power from Naruto would be perceived in the Fire Emblem Fates world and how they would have to adapt to new power hierarchies.
First, you need to understand the worlds of both Fire Emblem Awakening and Naruto. Know the characters, their abilities, and the settings. For example, in Naruto, the concept of chakra is central, while in Fire Emblem Awakening, the class system and weapon triangle are important. Then, come up with an interesting plot that combines elements from both. It could be a story where a character from one world is teleported to the other.