The plot could involve Naruto being reborn as Sesshomaru in a different realm. He would then have to deal with the politics and power struggles in that world. Since Sesshomaru is a powerful demon, Naruto would have to adapt to his new form and abilities. He might also meet characters from the Inuyasha series and form new alliances or rivalries.
Well, it could be a really wild plot. Maybe Naruto has Sesshomaru's memories or powers. He might have Sesshomaru's sword skills and use them in the ninja world. For example, he could use Tessaiga - like attacks against his enemies in a new and unexpected way. It would be a cool mash - up of the Naruto and Inuyasha universes.
Well, in a 'Naruto descendant of Sesshomaru' fanfiction, the plot could involve a journey of self - discovery. The descendant, say a young ninja, starts to notice strange abilities within themselves that are not typical of Naruto - style ninjutsu. As they dig deeper, they find out about their Sesshomaru lineage. This could lead to a conflict with the traditional ninja clans who are suspicious of this new and different power source. Eventually, the character could prove their worth and bring a new form of peace by combining the ninja way with the qualities of Sesshomaru.
One possible plot could be Naruto discovers his new heritage as Sesshomaru's heir. He then has to learn about the ways of the Inuyasha world while still dealing with his own ninja world problems.
One possible plot is that Naruto, as Sesshomaru's son, discovers his true identity later in life. He then has to learn about his father's world and culture. There could be a conflict between his loyalty to Konoha and his newfound family ties to the demon world. He might also encounter other demons who either want to use him for his power or are out to get him because of his mixed heritage.
One possible plot could be that Sesshomaru, while traveling through different dimensions, ends up in the Naruto world. He might initially be seen as a threat and have to fight some of the ninja. But then, he could encounter Naruto, who is curious about him instead of being hostile. They could team up to fight a common enemy, like an Akatsuki member who has a new, powerful jutsu that could endanger both their worlds.
One possible plot could be that a powerful villain tries to create a new Buu - like being using Naruto's chakra. But instead of creating a new Buu, Naruto is reincarnated as a hybrid of himself and Buu. This would lead to a lot of internal struggle for Naruto. He would have to deal with Buu's instincts while still trying to protect his village and friends. His friends might be initially scared of him, but over time they come to understand and accept this new Naruto.
The fanfiction could have a plot where Obito's reincarnation is not a normal one. He is reincarnated with a special mission from the afterlife. He has to find a way to bring peace to the shinobi world in a different way than Naruto did. He might have to face new enemies and also deal with the old grudges that still exist among the ninja clans. His reincarnation could also bring about a change in the relationship between the different villages as he tries to use his past experiences to create a more united and peaceful ninja world.
Maybe Naruto would have some of Ichigo's powers. For example, he could have a zanpakuto instead of a kunai.
In this fanfiction, perhaps Naruto is the reincarnation of Alucard due to some ancient prophecy. His journey would then be about discovering his connection to Alucard. He could start having strange dreams about Alucard's past life and battles. As he uncovers more, he realizes he has to use Alucard's powers to save the ninja world from a new, powerful threat that only his combined Naruto and Alucard abilities can defeat.
Perhaps the story could start with Naruto having strange dreams about Goku's life. As the story progresses, he gradually unlocks Goku's powers. He could then use these powers to protect the Hidden Leaf Village in a more powerful way. For instance, when the village is under attack by a powerful enemy, Naruto could transform into a Super Saiyan - like state, shocking his enemies and allies alike. His training would also change, as he'd have to learn to control his new Saiyan powers, which would be a whole new journey for him.
One possibility is that Naruto's reincarnation as Aizen would lead to a whole new set of battles. He might face off against some of the powerful Hollows or even the more powerful Soul Reapers who see him as a threat. His Naruto - based powers could be a huge advantage in combat. He could use his chakra control to enhance his sword skills or his ability to sense spiritual pressure. And his journey through the Bleach world as Aizen could be about finding a way to bring peace, just like he always aimed for in the Naruto world.