Well, it depends on the specific fanfiction. There are countless Naruto fanfictions out there. Some writers might decide to bestow the Mangekyou Sharingan upon Naruto for the sake of a creative plot twist. For example, it could be a result of some special and unforeseen circumstances in the fan - created story, like a powerful magic or a strange genetic experiment that goes wrong (in a good way for the story).
Sarada does have Mangekyou Sharingan in the manga. This development comes as a significant plot twist and showcases her growth and potential as a character. It occurs after she faces certain challenges and undergoes intense training.
Yes, Sarada awakens Mangekyou Sharingan. The manga builds up to this moment with a series of intense battles and character developments that lead to this power awakening.
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.
One possible story could be that a new character enters the Chunin Exams with a Mangekyou Sharingan. This could create a huge stir among the other participants. Maybe they use their unique abilities to quickly outwit their opponents in the early rounds. For example, they could use the Mangekyou Sharingan's genjutsu powers to make their enemies see illusions of powerful attacks, causing them to make mistakes in their defenses.
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.
Another way is to create a crossover where the worlds of Naruto (where the Mangekyou Sharingan comes from) and Harry Potter collide. In this scenario, the rules of both universes would have to be adjusted. For instance, the magic in Harry Potter could interact with the chakra system of Naruto. A character with the Mangekyou Sharingan could use it to detect hidden magical spells or even use their Sharingan - based abilities in magical duels, adding a new dimension to the battles in the Harry Potter world.
One idea could be a story where Naruto somehow acquires the Mangekyou Sharingan and Rinnegan. He then has to learn to control these new powers while facing an ancient evil that only he can defeat with the combined might of these dojutsu. Maybe he teams up with Sasuke, who also has his own power upgrades, and they have to figure out how to merge their abilities to save the ninja world.
In such a fanfiction, one possible plot could be that Naruto acquires the Mangekyou Sharingan through some kind of magical or experimental accident. Maybe a powerful enemy uses a jutsu that backfires and transfers the Sharingan to Naruto. Then Naruto has to learn to control its power while also facing the prejudice from those who fear the Sharingan's abilities.
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.