Well, Naruto's power would be severely reduced. Kurama was a huge source of his chakra and strength. Without Kurama's power, Naruto would have to rely more on his own natural abilities and the skills he has learned over the years. He might become more like his early self, having to strategize and train harder to face strong opponents.
Naruto's power might progress in several ways. Firstly, Kurama's serious training could involve better chakra control. Naruto could learn to access Kurama's chakra more efficiently without losing himself to the fox's rage. For example, he might be able to create more powerful and refined Rasengan variations. Secondly, Kurama could teach Naruto some of the ancient fox - related jutsus that have been lost over time. This would give Naruto an edge in battles, making him a more formidable opponent.
Well, Kurama might train Naruto by teaching him how to better control and access chakra. Since Kurama has a vast amount of chakra, it could show Naruto unique ways to harness and use it. For example, it could guide Naruto in creating more powerful and complex jutsu by using their combined chakra in a more efficient way.
Well, it would significantly boost his power. The Rinnegan is an extremely powerful dojutsu. Naruto already has his vast chakra reserves and Sage Mode. With the Rinnegan, he could gain new abilities like the Six Paths techniques. He might be able to manipulate gravity, use the Outer Path to revive the dead (though this has its own moral and plot implications in the fanfiction world). His combat capabilities would be off the charts, making him one of the most formidable characters in the fanfiction universe.
The Kurama Brothers could be entities that have a similar origin to Kurama. They might have been part of the same chakra - based creation in the Naruto universe. They could possess some of Kurama's traits like great power and a connection to the natural energy in the world. They are often depicted as having their own personalities, with one being more hot - headed and the other more calm and calculating. Their relationship with Naruto usually involves them using their powers and knowledge to help Naruto grow as a ninja and a person. They might also have their own goals and motives that are intertwined with Naruto's journey.
For Naruto, it would be a whole new experience. He'd be constantly trying to communicate with the mecha Kurama, learning its quirks. Shikamaru might be the one thinking about the strategic uses of mecha Kurama in battle. He'd be coming up with plans on how to best utilize it. As for Kurama, he could be in an internal struggle. Part of him would want to stay relevant in Naruto's battles, while another part would be curious about this new mechanical version of himself and how it could help Naruto in the long run.
Kurama might become angry at first. He's a powerful being and being neglected would likely wound his pride. He could start causing some minor disruptions inside Naruto, like making it harder for Naruto to access his chakra.
Well, it could be about a high - tech world where Naruto has a mecha version of Kurama. Maybe the plot involves fighting new and powerful enemies that can only be defeated with the combined strength of Naruto and his mecha Kurama. The fanfic could also explore how Naruto bonds with this mechanical version of Kurama, different from his connection with the original Kurama.
His power level would skyrocket. The Rinnegan has a vast array of abilities. Naruto already has a huge amount of chakra from Kurama. When combined with the Rinnegan, he could use the Rinnegan's techniques to enhance Kurama - related attacks. For example, he might be able to use the Preta Path to absorb chakra while in his Kurama - enhanced form. This would not only make him stronger in battle but also more versatile as he could counter different types of opponents more effectively.
It might be portrayed as a very strong and almost spiritual connection. They could be shown as two halves of a whole, with Naruto relying on Kurama not just for power but also for emotional support and vice versa.