Balancing the different mythologies can be really tough. In a 'dark hunter crossover fanfiction' like one with the Norse mythology - based universe, you need to make sure that the rules of the Dark Hunter world, such as their powers and the way their society works, don't clash too much with the Norse gods and their powers. It takes a lot of research and careful planning. Also, making the plot flow smoothly when combining two very different settings is no easy feat.
The challenge also lies in pleasing the fans of both universes. Fans of the Dark Hunter series have certain expectations about their favorite characters and the overall feel of the story. And fans of the other crossover universe, say the Star Trek universe, also have their own set of hopes. So, the writer has to find a middle ground that satisfies both groups while still creating an original and engaging story.
One challenge is integrating the different mythologies. 'Supernatural' has its own complex lore about demons, angels, and the like, while 'Dark Angel' has the whole genetic - engineering and post - apocalyptic backstory. Merging these two can be really tricky.
One challenge is staying true to the lore of both franchises. For example, Gundam has its own set of mecha designs, technologies, and political backstories. When crossing over with another series like 'Mobile Suit Gundam Wing' and 'Cowboy Bebop', you need to make sure the Gundam elements fit into the Bebop universe without breaking its established rules. Another challenge is character development. You have to make the characters from different universes interact in a believable way.
Well, first of all, you need to have a good understanding of both Naruto's world and the world of the other series you're crossing over with. Let's say it's a Naruto and Final Fantasy crossover. You need to know how the magic and summons in Final Fantasy work, and how to integrate Naruto's ninja techniques. Also, pleasing fans of both series can be difficult. Fans of Naruto might have different expectations compared to fans of, say, the Witcher series when you do a crossover. You have to find a balance so that both groups of fans can enjoy the fanfiction.
One challenge is staying true to the original characters. For example, Carrie has very specific traits and a backstory. When crossing her over into another universe, like say, the Star Trek universe, you have to make sure her character still makes sense. You can't just change her personality completely.
Balancing the different universes' power scales is difficult. If Doomfist is crossed with a universe where the characters are much weaker, he could become overpowered and make the story uninteresting. Conversely, if he's in a much more powerful universe, he might seem insignificant. You have to find a way to make his abilities relevant.
Character consistency can be tough too. For example, if you cross the Magisterium with a more heroic - based universe like Marvel, the Magisterium characters might need some adjustment to fit into that world's heroic - villainous dynamic. And you have to keep their personalities intact while making those adjustments.
One challenge is staying true to the characters from both series. The 2012 turtles have different personalities compared to the 2018 ones. For example, the 2012 Leonardo is more strict about following rules, while the 2018 Leo is more laid - back. You have to make sure that when they interact, it makes sense based on their original characterizations.
Character consistency is also a big deal. The characters in 'Dishonored' have their own personalities and motives. In a crossover, you need to make sure they act in - character even when put in new and strange situations from the other universe. And then there's the world - building aspect. Merging two different fictional worlds without making it seem forced is not easy.
One challenge is maintaining the integrity of the original 'Taken' story while integrating elements from the other franchise. For example, if it's a crossover with a superhero story, the gritty realism of 'Taken' might be hard to balance with the superpowers. Another issue is making the crossover believable. Readers need to be able to suspend their disbelief and see how the characters from two different worlds can co - exist and interact.
One challenge is getting the characterizations right. Homestuck has very distinct and complex characters, and when you cross them over with characters from another fandom, you need to make sure they all stay true to their original selves. Another is the world - building. Combining two different fictional worlds can be tricky to make it seem seamless.