A really cool fanfiction concept could be a time - travel story. A character from the future, who has a diluted Sharingan bloodline, goes back in time to the era of the founding of the Hidden Leaf. They use their knowledge of the Sharingan's future capabilities to change the course of history for the Uchiha clan.
Another interesting idea is a story about an Uchiha who loses their Sharingan in a battle but then discovers a new way to regain it, not through the traditional means like transplant or awakening. It could involve some sort of spiritual journey and self - discovery within the context of Naruto's world.
One idea could be a story where a non - Uchiha character somehow gains the Sharingan. Maybe through a scientific experiment gone wrong in Orochimaru's lair. They then have to learn to control it without any prior knowledge of the Uchiha clan's ways.
Well, one idea could be exploring a scenario where Sasuke's Sharingan is overlooked by the village in a different way than in the original story. Maybe they see it as more of a curse than a power and try to suppress it, which could lead to a whole new set of conflicts for Sasuke.
In 'eternal sharingan naruto fanfiction', there might be a focus on the relationships between characters. For example, how a character with the Eternal Sharingan interacts with Naruto and his friends, perhaps leading to new alliances or rivalries. It could also show how the power of the Eternal Sharingan affects their perception of the ninja world.
A possible plot could be that Naruto is given a temporary Sharingan by an ancient Uchiha spirit. With this Sharingan, he starts to see the world in a different way, and he realizes that there are hidden threats in the ninja world that only the Sharingan can detect. He then embarks on a journey to find out more about these threats and how to stop them. Another plot could be that Naruto meets an Uchiha survivor who teaches him how to use the Sharingan in a way that no one else has thought of. This new way of using the Sharingan could help Naruto in his fight against the Akatsuki. And there could also be a plot where Naruto's Sharingan evolves in a unique way because of his Uzumaki heritage.
One idea could be a story where Naruto somehow gains the Golden Sharingan. He could use its unique powers to see through genjutsu more easily and also have enhanced perception in battle. For example, he might be able to predict his opponents' moves better. Another plot could involve Naruto using the Golden Sharingan to unlock a new form of his Rasengan, perhaps one with the ability to disrupt an enemy's chakra flow on a deeper level. Or, it could be a story where Naruto has to team up with a character who has knowledge of the Sharingan to fully understand and control the Golden Sharingan's powers.
One idea could be a story where the main character, who has the Eternal Sharingan, has to face a new and powerful enemy that can manipulate time. With the power of the Eternal Sharingan, the character has to find a way to break the enemy's time - based attacks and defenses. Another plot could revolve around a character with the Eternal Sharingan trying to uncover long - lost secrets of the Uchiha clan that are hidden deep within the Sharingan's powers. Maybe there are ancient jutsu or prophecies that only the Eternal Sharingan can unlock.
One idea is that an enemy targets Kakashi's Sharingan and Naruto has to protect it. Along the way, Naruto learns more about the Sharingan's capabilities and how to use it against the enemy. This would be a great opportunity for Naruto to grow as a ninja and for their friendship to deepen.
One idea could be a character from RWBY obtaining the Sharingan and using its abilities in combat. For example, Ruby could get the Sharingan and combine its precognitive abilities with her own speed, making her an even more formidable fighter.
One idea could be that Hatake Kakashi somehow transfers his Sharingan to Naruto in a dangerous mission. This would give Naruto new abilities and a whole new set of challenges to face. He'd have to learn to control the Sharingan quickly while also dealing with the enemies who might target him specifically for it.
A fanfiction could focus on a character who is immune to the effects of Madara's Sharingan. This character could be a new type of ninja from a far - off land with a unique chakra nature that counteracts the Sharingan's genjutsu and other abilities. The story could be about how this character challenges Madara and changes the power dynamic in the Naruto universe.
One idea could be that the character with the Sharingan is banished due to false accusations of using its power for evil. He then has to journey alone, facing challenges and learning to control his power in new ways. Maybe he meets a group of outcasts who he befriends and together they fight against the unjust system that banished him.