He would likely become more brooding. With the dark and godlike Rinnegan, Naruto might start to question his previous beliefs. He could be more isolated as he tries to figure out his new power, which is different from the chakra he's used to. His usual sunny and optimistic personality might be overshadowed by a more serious and cautious side.
If Naruto had a dark godlike Rinnegan in a fanfiction, his character would go through a significant transformation. His confidence would take on a new form. It wouldn't be just the brash confidence of his youth, but a more calculated and almost menacing confidence. He might lose some of his naivete and become more worldly - wise. His relationships would also be affected. His friends might find it hard to relate to him at first, and he would have to work hard to maintain those bonds. He could also develop a new sense of purpose that is tied to the power of the Rinnegan, perhaps feeling a greater responsibility for the ninja world, but in a more complex and less idealistic way than before.
His relationship with Sasuke would be greatly affected. Sasuke might see Naruto's new dark godlike powers as a threat to his own goals of power and revenge. He could become more hostile or, on the other hand, be intrigued and try to understand how Naruto got these powers. Naruto's friends in Konoha would also be divided. Some might be scared of his new form and power, while others would try to support him and bring him back to his old self.
His character would have a darker edge. The vampire nature could bring out a more primal and possessive side. And the Rinnegan would give him new levels of power and knowledge. He might start to question his old values as he realizes the potential of his new powers. He could become more solitary, training alone to master his combined abilities rather than relying on his friends like he used to.
If Naruto got the Rinnegan, he might become more cautious. The power of the Rinnegan is so great that he would realize he needs to be more careful with it. He wouldn't be as brash as before.
He might become more brooding and serious. The connection to Hades could bring out a darker side to his personality.
He might also become more isolated at first. The power of the Rinnegan could make him feel different from his friends. He may think that they can't understand what he's going through with this new power, so he could withdraw a bit until he learns to balance his new abilities with his old relationships.
The other ninja villages would view Naruto very differently. They might see him as an even greater threat now. This could lead to more tense relations between Konoha and the other villages. At the same time, some younger ninja from other villages might idolize Naruto even more and try to learn from him, hoping to gain some of his power. This would create a complex web of relationships and power dynamics in the Naruto fanfiction world.
Well, it might be about Naruto being bestowed with the Rinnegan in a way that's connected to a dark deity. The story could then explore how Naruto has to adapt to this new power. He might struggle with the darker impulses that come with the godlike Rinnegan. For example, the power could make him more ruthless in battle, and he has to find a balance between using this new strength and maintaining his moral code. It could also lead to new alliances and enemies, as different factions in the ninja world react to his transformation.
Well, at first it might cause some strain. His sister may feel overshadowed by Naruto's new power. But as time goes on, Naruto could use the Rinnegan to help his sister discover her own latent abilities. This would transform their relationship into one of mutual growth and support. He could use the powers of the Rinnegan to train her in unique ways, and she could in turn offer him emotional support, making their bond even deeper than before.
They could fit in as a new type of pirate. The Rinnegan's powers would give them an edge in combat and exploration. For instance, they could use the Preta Path to absorb attacks from devil fruit users, like Logia types. This would make them a feared opponent on the high seas.
Naruto would likely become more confident. With such a powerful ability as the godlike Sharingan, he would know he has an edge in battles. He might also become more cautious, as he realizes the great responsibility that comes with such power. For example, he wouldn't want to accidentally harm his friends with a new, powerful genjutsu from the Sharingan.