One possibility is that the fused character would have an incredible combination of powers. Naruto's Rasengan and Sasuke's Chidori could merge into a new, super - powerful jutsu. Also, their personalities might blend, creating a character who is both hot - headed and brooding at times, but with a strong sense of justice.
The story could start with some sort of magical or scientific accident that causes the fusion. Then, they might have to deal with people being afraid of their new, extremely powerful form. Their friends would be confused at first but then try to help them control this new power.
If Naruto fused with Bardock in fanfiction, the story would likely take a very different turn. At first, Naruto might be confused by his new abilities and instincts. He would need to train to master them. As he does, he would become a more prominent figure in the ninja world. He could potentially change the balance of power. Enemies would be more afraid of him, and allies would look to him for leadership. His journey would be about not only protecting the village but also about understanding his new Saiyan heritage.
The power balance would be greatly affected. If fanfiction gives Naruto some overpowered abilities like instant teleportation across any distance, it would make many of his battles much easier. Enemies that were once a threat would no longer be so.
If Naruto fused with Majin Buu in fanfiction, the story might start with the fusion's initial confusion about its new powers and identity. As it tries to figure things out, it could attract the attention of various villains who see it as a threat or an opportunity. The story could then be about the fusion's journey to master its powers and find its place in the world while dealing with these antagonists.
One of the popular pairings is Naruto and Hinata. Their relationship has a strong foundation in the original series, and in fused fanfiction, it can be explored in new and exciting ways, especially when fused with different settings or storylines. Another popular pairing is Sasuke and Sakura. Their complex relationship offers a lot of room for creativity in fanfiction, like fusing their story with a time - travel plot. Kakashi and any female character also tend to be popular in some fused fanfictions, as Kakashi is a very beloved character with a mysterious past that can be intertwined with other characters in interesting ways.
One interesting concept could be fusing Naruto's world with another popular anime world. For example, fusing it with the world of One Piece. Imagine Naruto characters having to deal with Devil Fruits and the Grand Line. Another concept might be fusing different ninja clans in unique ways within the Naruto universe itself, like creating a new type of jutsu that combines the powers of the Uchiha and Hyuga clans. Also, fusing Naruto with a modern - day setting, where ninjas have to adapt to technology while still using their chakra abilities.
Well, Naruto might gain some really strange abilities. Cell can regenerate and absorb energy. So Naruto could potentially have super - enhanced healing powers. He might also be able to absorb chakra from others like Cell absorbs energy. This could make him extremely powerful in battles, being able to quickly recover from injuries and constantly boost his power.
Often, the Akatsuki still remain as main antagonists. Since Naruto's fusion with the Kyuubi makes him more powerful, they would be even more interested in capturing him for his power.
In such a fanfiction, Naruto's powerful chakra could be combined with Madara's Uchiha abilities in really interesting ways. Naruto might gain new Sharingan - like powers or be able to use some of Madara's signature jutsu more effectively. And their combined strength would probably make them nearly unbeatable in battle, changing the power dynamics in the Naruto universe completely.
The appearance of a Naruto - Ichigo fusion in fanfiction would likely be a blend of their features. Maybe he would have Naruto's spiky hair color but with Ichigo's hair style. His eyes could be a mix of Naruto's blue and Ichigo's brown. And he might wear a combination of their outfits, like Naruto's orange jumpsuit with some elements of Ichigo's Soul Reaper robes.