If Kaguya is sealed in Naruto in a fanfic, Naruto could potentially use Kaguya's power for good. He might be able to access new jutsu or abilities that were previously unknown. However, there would also be risks. The power could be corrupting, like it was for Madara when he got some of Kaguya's power. Naruto would have to rely on his strong will and the support of his friends to keep from being consumed by it. He could also try to study Kaguya's power to find a way to break the cycle of hatred that has been plaguing the ninja world for so long.
The story changes a great deal. Naruto becomes a sort of living prison for Kaguya's power. His relationships might be strained as people fear what he could become. The Hidden Villages might keep a closer eye on him.
In some fanfictions, Kaguya being sealed might lead to new mysteries emerging. For example, there could be hidden secrets or powers that were associated with her that now start to surface. This could draw in new characters or lead to new adventures for the existing ones. Maybe some of Kaguya's leftover chakra starts to influence certain events or people in unexpected ways.
Kakashi can be a popular character too. His wisdom and combat skills can be useful in fanfic scenarios involving Kaguya. He could be a mentor figure to Naruto, guiding him in dealing with Kaguya - related threats or helping to decipher ancient ninja knowledge related to Kaguya.
The story could develop with the ninja world exploring new forms of ninjutsu or chakra control now that Kaguya's influence is no more. For example, they might discover new ways to harness natural energy without the fear of it being corrupted by Kaguya's power.
One implication could be a significant power boost for Naruto. Since Kaguya was an extremely powerful being, having her sealed within him might give Naruto access to new levels of chakra and abilities. For example, he could potentially gain more control over space - time ninjutsu, which was Kaguya's specialty. This could make him even more formidable in battles against powerful foes.
One common theme is redemption. Since Kaguya was initially a villain, many fanfics explore her journey towards redemption with Naruto's help. Another theme is power. How their combined powers can be used for different purposes, like protecting the ninja world. For example, in some fanfics, they use their powers to fight off a new threat that is stronger than any they've faced before.
One good Naruto x Kaguya fanfic is 'The Last Dance'. It explores an alternate universe where Naruto has to team up with Kaguya against a new, powerful enemy. The story does a great job of building their relationship from mutual distrust to a deep understanding.
One great 'Naruto Uchiha Kaguya Fanfic' is 'The Legacy of Kaguya'. It delves deep into the backstory of Kaguya and how it ties to the Uchiha clan in Naruto's world. The character development is really well - done and it keeps you hooked from start to finish.
A unique feature is the expansion of the Naruto universe's lore. Fanfics about Kaguya can introduce new powers, ancient prophecies, or hidden civilizations related to her. They can also bring in other characters in new ways, making them interact with Kaguya and Naruto in unexpected relationships. For instance, a side character might become the key to understanding Kaguya's true intentions. Moreover, the fanfics can explore different endings or consequences of Kaguya's actions in the Naruto storyline, which gives readers a fresh perspective on the whole Naruto - Kaguya saga.