The story could also explore the origin of the Rinnegan used for the transplant. Was it obtained through some dark and forbidden means? Maybe it was taken from an ancient and powerful being. This could lead to a whole sub - plot where the original owner or their followers try to get the Rinnegan back. And the character who got the transplant has to deal with these pursuers while still trying to come to terms with their new abilities.
Another aspect could be the reaction of the other characters in the Naruto universe. Some might be fearful of the new power, thinking the character with the transplanted Rinnegan could become a threat. Others might see it as an opportunity to use this new - found power for their own purposes, like fighting against a common enemy. There could be a lot of political intrigue and power struggles within the ninja villages as a result.
One possible plot development could be that Naruto gains a whole new level of power and is able to see and understand the world in a different way. He might be able to use the Rinnegan's abilities to finally bring true peace to the ninja world. For example, he could use the power of the Rinnegan to better understand the motives of his enemies and find non - violent solutions to conflicts.
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 possibility is that Naruto's friends launch a rescue mission. They would use their unique skills, like Sasuke's Sharingan or Sakura's medical ninjutsu combined with her combat skills, to find and save Naruto.
A third plotline could be about a character getting a Sharingan transplant to save someone else. For example, a friend is dying and the only way to preserve their Sharingan - related memories or abilities is to transplant it into another. This would create a moral dilemma for the recipient as well as a complex emotional journey as they try to live up to the legacy of the Sharingan.
Well, the character might become more confident, or perhaps overconfident. The power of the Rinnegan can be overwhelming, and they might start to think they're invincible. For example, they could become more reckless in battles, taking on stronger opponents without proper planning.
One possible plot development could be Naruto having to relearn his ninja skills with only one arm. He might struggle at first, but then discover new ways to use his remaining arm in combination with his chakra control. For example, he could focus more on using his legs for powerful kicks and use his one arm mainly for balance and quick jabs of kunai or shuriken. Another aspect could be the psychological impact. Naruto might feel a sense of loss and inadequacy, which could lead to some self - discovery as he overcomes these feelings and becomes stronger in the end.
The plot could also explore how Naruto's identity as Nagato's son affects the Akatsuki. Maybe some members of the Akatsuki would try to recruit him or use him for their own purposes. On the other hand, Naruto might try to reform the Akatsuki from within. His connection to Nagato could also lead to a different resolution of the conflict between the ninja villages. Instead of just uniting the villages as in the original story, he could aim to create a more global peace based on Nagato's broader view of the world, which was not just limited to the ninja villages.
Another aspect could be his relationship with the other characters. Since he already knows about Kurama, he can better explain things to his friends like Sasuke or Sakura. This could strengthen their bonds as they face new challenges together. He might also be more respected or feared by some of the villagers who were previously unaware of his connection with Kurama, which would add a new layer of complexity to his interactions within the village.
In this 'naruto gets poisoned fanfiction', Naruto could also try to fight the poison using his own chakra. He might enter a state of inner struggle where he has to battle the effects of the poison on his body while still trying to protect the village. His Nine - Tails chakra could play a role, either helping him resist the poison or making the situation more complicated if it reacts badly with the poison.
One possible plot development could be that after saving Naruto, Madara tries to mentor him. He sees Naruto's potential and wants to shape him into an even greater ninja, sharing his own knowledge and skills that have been honed over years.