I would recommend 'Naruto's Rinnegan Adventure'. It's a story that delves deep into the implications of Naruto having the Rinnegan. It explores how it affects his relationships with his friends, his standing in the ninja world, and his own understanding of his place in the grand scheme of things. The story is well - written and keeps you hooked from start to finish.
In a fanfiction where Naruto secretly has the Rinnegan, he would become an even more formidable force. His combat abilities would skyrocket. He could potentially use the powers of the Rinnegan, like the Six Paths techniques, in addition to his existing Sage Mode and Nine - Tails chakra. This would make him a major threat to any enemy. He might be able to travel between dimensions more easily and have better control over life and death, just like Madara and Sasuke did with their Rinnegan.
One possible plot could be that Naruto discovers a hidden power within himself that transforms his Rinnegan into the Eternal Rinnegan. Then he has to learn to control this new power quickly as a new and powerful enemy emerges. He uses his new - found power to protect the village and his friends.
Well, it could make Naruto extremely powerful right from the start. With the Rinnegan, he might be able to master all types of jutsu more quickly. He could also have an edge in battles against powerful foes like Madara or Kaguya. Maybe he'd be able to use the six paths techniques with more ease and less training.
Definitely. In some fanfics, Naruto uses the Rinnegan to rewrite the rules of ninjutsu. He could develop new techniques that are based on the Rinnegan's abilities, such as the ability to revive the dead in a different way than the traditional Edo Tensei. This makes him a target for those who oppose such a radical change in the ninja world.
A plot development might involve Naruto struggling to control the Rinnegan at first. Sasuke, noticing this, believes he can defeat Naruto easily with his Sharingan. But as Naruto starts to master the Rinnegan, he shows new abilities that shock Sasuke. This could lead to a situation where they have to team up against a common enemy who is after the power of both the Rinnegan and the Sharingan. Or perhaps a prophecy is revealed that states only one of them can keep their dojutsu power and they must fight to decide who keeps it, leading to a moral and power - based struggle.
One possible antagonist could be a rogue ninja who also wants the power of the Rinnegan. He might see Naruto as a target to either steal the power from or eliminate so that he can be the most powerful in the ninja world. This character could be a new creation or an existing villain with a new motivation.
A third plotline could be about Naruto having to deal with the jealousy and suspicion of others in the ninja world because of his newfound Rinnegan. Some might see it as a threat or a sign that he's becoming too powerful. This would create a lot of political and personal drama for Naruto as he tries to prove that he's still the same person and that he'll use the power for good.
One potential plotline could be Naruto using his new powers to finally bring true peace to the ninja world. He could use the Sharingan to understand the root causes of conflicts by seeing through people's true intentions and the Rinnegan to reshape the world in a more harmonious way.
One implication is that he becomes much more powerful. The Rinnegan gives him access to powerful abilities like the Six Paths techniques, which would change the power dynamics in battles in the fanfiction. He could now face stronger enemies more easily.