Well, a cool plot might be that a ninja with the Mangekyou Sharingan gets transported to a different dimension where the rules of chakra and the Sharingan are completely different. They have to figure out how to adapt and use their Mangekyou Sharingan in this new world. Maybe they meet alternate versions of their friends and enemies there. Also, a story could focus on the origin of a special Mangekyou Sharingan ability that was thought to be just a legend in the Naruto universe.
One idea could be a story where the protagonist discovers a new and unique power within the Mangekyou Sharingan that has been lost for generations. This power could give them an edge in battles against powerful foes like the Akatsuki. Another plot could revolve around a character who has to overcome the dark side effects of using the Mangekyou Sharingan, such as losing their sight at a faster rate. They could search for a way to counter this while still using the power to protect their village.
One idea could be exploring a different origin for the Mangekyou Sharingan. For example, what if it was related to an ancient Uchiha pact with a hidden spirit? Another could be a story where a non - Uchiha character somehow gains the ability to use the Mangekyou Sharingan and has to deal with the consequences. Or perhaps a fanfiction where the Mangekyou Sharingan has additional powers that are not shown in the original Naruto series, like the ability to time - travel.
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.
One idea could be exploring how Itachi uses his Eternal Mangekyou Sharingan to change the past. Maybe he goes back in time to prevent the Uchiha massacre and has to deal with the consequences of altering such a major event in the ninja world.
Another idea is a crossover with a superhero universe. Imagine a character like Sasuke with his Mangekyou Sharingan powers suddenly in the Marvel or DC universe. He could team up with heroes like Spider - Man or Batman. His Sharingan's ability to copy moves could be really interesting when facing off against super - villains.
One popular plot idea could be a character with Mangekyou Sharingan traveling back in time to prevent a major tragedy in the Naruto universe. For example, stopping the Uchiha massacre. This would create a whole new set of events and relationships. Another idea might be a time - traveling ninja using the power of the Mangekyou Sharingan to gain knowledge from the past and use it to change the future of their clan. They could learn ancient jutsu or secrets that were lost over time.
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.
Well, in some 'naruto of the mangekyou sharingan fanfiction', there might be a plot where a character discovers a hidden power within the Mangekyou Sharingan that was previously unknown. This power could be related to time - like being able to freeze time briefly in a battle. Or perhaps a story where the wielder of the Mangekyou Sharingan has to make a difficult choice between using its power for good or succumbing to the dark temptations that often come with such a powerful ability. It could lead to an internal struggle that shapes the character's journey.
One creative plot twist could be a character who was thought to be a normal ninja suddenly reveals they have a Mangekyou Sharingan with a unique power that changes the whole power dynamic in the story. For example, a side character who has been helping the main character all along, but then uses their Mangekyou Sharingan to stop an impending doom that no one else could. Another could be that the Mangekyou Sharingan has the ability to swap the powers of other ninjas, creating chaos and new alliances.
A cool plot idea might be a Sharingan warrior from a different dimension coming into the main Naruto universe. This warrior has a unique way of using the Sharingan that no one in the main universe has seen before. They could either become an ally or a formidable enemy, depending on their motives. Their presence could disrupt the existing power balance and force the characters in the Naruto world to adapt and find new ways to combat this new threat or form new alliances with this strange visitor.