One possible plot could be that Naruto gains the Eternal Mangekyou Sharingan through some sort of unexpected and mysterious event. Maybe it's a result of a powerful jutsu gone wrong that fuses his own chakra system with that of a Sharingan - user. This new power could initially be difficult for Naruto to control, leading to him having to isolate himself to figure it out. As he masters it, he could use it in unique ways, like combining the Sharingan's abilities with his own Rasengan techniques, creating entirely new and powerful attacks.
The plot might involve Naruto getting the Eternal Mangekyou Sharingan as a gift from an ancient being. With this power, he has to face new and stronger enemies. He might discover that the Sharingan has a connection to the Nine - Tails within him. For example, the Sharingan could allow him to better communicate with the Nine - Tails or even access some of its hidden powers. This would make Naruto even more of a force to be reckoned with in the ninja world.
In the fanfic, Naruto having the Eternal Mangekyou Sharingan could lead to a change in his relationships. His friends might be both in awe and a bit worried about this new power he has. Sasuke, being an Uchiha, could have a complex reaction. Maybe they would train together to better understand and control this power. Naruto could also use it to try and bridge the gap between the Uchiha and the rest of the village even more, as he now has a part of the Uchiha heritage in a very powerful way.
The plot could involve some sort of time - travel or alternate dimension scenario. Naruto could be sent to a parallel world where the Uchiha clan was never massacred. There, he befriends the Uchiha and learns their ways. Eventually, he earns the right to receive the Eternal Mangekyou Sharingan through his deeds and his strong bond with the clan. With this new power, he has to find a way to return to his own world and use it to protect his friends and village from a new, greater threat.
Power. The eternal mangekyou sharingan represents a great power in the Naruto world, so many fanfics focus on how characters use or struggle with this power.
The Eternal Mangekyou Sharingan is a very powerful and significant element in Naruto fanfiction. It represents a high - level evolution of the Sharingan. In fanfictions, it often gives the characters who possess it extraordinary abilities, like enhanced visual powers, the ability to use unique and powerful jutsus.
One possible plot twist could be that Naruto gains the Mangekyou Sharingan in a moment of extreme emotional turmoil, like seeing Sasuke in a life - threatening situation. This new power might make him an outcast in Konoha at first, as the Sharingan is a symbol of the Uchiha. Another twist could be that the Mangekyou Sharingan has some unforeseen side effects on Naruto's chakra system, making it difficult for him to control his normal jutsu. It could also lead to a power struggle within the village as some might fear Naruto's new - found power.
Another possibility is an ancient evil that has been awakened by the presence of Naruto's new power. The Eternal Mangekyou Sharingan might emit some sort of energy that disturbs an old seal or something. This ancient evil could be a powerful demon or a long - forgotten ninja with dark powers. It would be a huge threat not only to Naruto but also to the entire ninja world, and Naruto would have to use his new - found power along with his usual determination to stop it.
In Naruto fanfiction, it's often portrayed as extremely powerful. It can give characters abilities like seeing through any illusion, predicting an opponent's moves with near - perfect accuracy.
One implication is a change in his power level. The Mangekyou Sharingan gives access to powerful jutsus, so Naruto would be even more formidable. He might also face new enemies who are interested in his new ability.
A possible plot is that Naruto gets the Mangekyou Sharingan in a fight against a powerful enemy. With this new ability, he is able to see the enemy's weaknesses more clearly. He could use the unique abilities of the Mangekyou Sharingan, like Tsukuyomi or Amaterasu, in his own unique way, since he is not an Uchiha. For example, he might combine it with his Rasengan. This would lead to new and exciting battles and also a journey of self - discovery as he tries to understand this alien power within him.
A possible plot could be that Dark Naruto's Eternal Mangekyou Sharingan has a special power that can merge the minds of people. He uses this to merge with the good Naruto inside him. Through this merge, he battles his inner demons and slowly transforms back to his normal self while also gaining the combined strength of both his dark and light sides.