The plot could center around Naruto gradually realizing he is the heir of Kaguya. It might start with small signs, like an unexplained attraction to certain places or objects that were related to Kaguya. As he delves deeper, he finds that he has abilities that are far beyond what he thought possible. His friends, like Sasuke, might initially be skeptical or even worried, but Naruto would prove that he can use these powers for good, and they would all work together to face new threats that come because of Naruto's new status.
In this fanfiction, the plot might involve Naruto being the heir of Kaguya because of some ancient prophecy or a hidden bloodline connection. He could then be hunted by those who fear his potential power. Naruto would have to fight against these enemies while also trying to understand the true nature of his inheritance. He might also uncover secrets about the origin of chakra that were related to Kaguya, which could change the whole understanding of the ninja world.
In some fanfictions, Naruto can be depicted as Kaguya's heir. Fanfiction allows for a great deal of creative freedom, so authors might create a storyline where Naruto has some connection to Kaguya that makes him her heir. This could be based on new powers or abilities that Naruto discovers which are related to Kaguya's in some way.
Obviously Naruto would be one of the main characters since it's about him being the heir of Kaguya. Sasuke could also be a main character as Naruto's rival and friend. Sakura might be involved too, as she is part of Naruto's team. And there could be other characters like Kakashi, who would play a role in guiding Naruto as he discovers his new identity. There might also be some new characters introduced that are related to Kaguya's past, who either help or hinder Naruto on his journey.
A possible reason is to create a new narrative arc. By making Naruto Kaguya's heir, the fanfiction author can introduce a whole new set of challenges and relationships for Naruto. He might have to deal with the legacy of Kaguya, which could include facing enemies who want to use or destroy him because of his connection to her. It also allows for a deeper exploration of the Naruto world's lore and the origin of chakra.
The plot could involve Naruto delving into the history of his family and Kaguya's past. He could learn secrets that were long buried, and this knowledge could be used to either save the ninja world from a new threat or to bridge the gap between different ninja clans that have been at odds because of Kaguya's actions in the past. Naruto's new status as Kaguya's brother could be a catalyst for great change in the Naruto universe.
Well, it could be that Naruto is in a near - death situation, poisoned or severely injured. Kaguya, having a change of heart, decides to save him. She might use her chakra to heal Naruto's wounds and restore his strength. It could also be that Kaguya saves Naruto from a trap set by an ancient evil that she has knowledge of. She steps in because she realizes Naruto's importance in the balance of the ninja world.
One possible plot could be that Naruto, in his godlike state, tries to understand Kaguya's past and motives more deeply. He might use his newfound power to communicate with her on a different level, perhaps even showing her a different way of seeing the world. This could lead to a redemption arc for Kaguya, where she starts to regret her past actions.
In this fanfiction, perhaps Naruto breaks Kaguya by outsmarting her. He could use his quick thinking and knowledge of her weaknesses. He might form alliances with other characters in ways that give him an edge over Kaguya, and then use his signature Rasengan in a new and unexpected way to break her power.
The plot could also involve Naruto raising Kaguya to be a force for good in a world that still has remnants of evil. Kaguya, with Naruto's guidance, could use her vast power to help in rebuilding areas damaged by past wars. Naruto may also introduce her to the concept of family, which she may have lost touch with long ago, and this new understanding could transform her character completely.
The plot might involve Naruto learning about his heritage as Kaguya's son. This could lead to a whole new understanding of the ninja world for him. He might face discrimination from some who fear his power, while others see him as a potential savior. He could also have to unlock the secrets of Kaguya's power within himself to face a great threat.
Well, it could have a plot where the protagonist, as the heir of Madara, tries to reshape the ninja world according to Madara's unfulfilled ideals. Maybe they strive to unite all the ninja clans under a new order.