In this type of fanfiction, the idea of alternate universes can be really cool. Picture a world where Naruto got the eternal mangekyo much earlier in his life. How would that change the entire story arc? He might be able to prevent some of the tragedies that occurred in the original series. And then there's the potential for new character developments. Characters like Sasuke might react differently to a Naruto with the eternal mangekyo, leading to a whole new set of interactions and storylines.
Well, often in 'eternal mangekyo naruto fanfiction', the exploration of the power limits is quite interesting. It could show Naruto achieving power levels far beyond what was shown in the original, like being able to manipulate time or space using the eternal mangekyo. Also, the fanfiction might delve into the psychological effects of such great power on Naruto. He might struggle with the newfound abilities and the responsibility that comes with them.
One interesting concept could be new and unique jutsu. For example, the author might create a jutsu that combines the powers of the eternal mangekyo in a way that has never been seen in the original Naruto series. Another concept could be different character relationships. Maybe in the fanfiction, characters who were enemies in the original become allies, all because of the power of the eternal mangekyo.
Another concept is the character development. The presence of the Eternal Mangekyo Sharingan often brings a deeper level of conflict and growth for the characters. They might have to struggle with the power it bestows, such as the risk of going blind or the moral implications of using its more sinister abilities.
One interesting fanfiction could be about a character from Naruto who somehow gets transported to the Fairy Tail universe and has to deal with the magic there while still having their EMS powers. For example, Sasuke could end up in Magnolia and form an unlikely alliance with Natsu to fight a common enemy.
One interesting concept could be the exploration of new sage powers. Maybe the characters in the fanfiction discover unique ways to use sage mode that were not shown in the original Naruto series. For example, they might be able to combine different elements while in sage mode in a more efficient way.
The idea of new alliances and rivalries can also be explored. With the power of the Eternal Rinnegan, other ninja villages may either seek an alliance or become rivals. Fanfiction could delve into the politics and power dynamics between villages, and how the character with the Eternal Rinnegan navigates these complex relationships.
Naruto is usually a main focus, as the title implies it has to do with his connection to the eternal mangekyo. Sasuke is also often a key character. Their relationship and how it changes due to Naruto having the eternal mangekyo powers can be a major part of the story.
Sasuke Uchiha is often a central character. Since he already has the Sharingan in the original series, in fanfiction with the Eternal Mangekyo Sharingan, he can be further developed. His journey to master this new level of power and how it affects his relationships, especially with Naruto, can be a major focus.
One possible plotline could be Naruto unlocking the Mangekyo Sharingan through some strange and unforeseen means, perhaps a powerful jutsu backfires and gives him this new power. Then he has to struggle with controlling it while his friends are both amazed and a bit worried about this new development in him.
One interesting concept could be the exploration of different pantheons interacting more deeply. For example, in some fanfictions, the Greek and Norse pantheons might team up for a common goal. Another concept could be the development of minor characters from the original series, giving them more backstories and important roles.
One common theme is power struggle. When a Harry Potter character gets the Eternal Mangekyo Sharingan, they have to deal with the new power and how it affects their relationships. Another theme is identity. They might question who they are now that they have this new ability from a different universe. For example, a Gryffindor might struggle with the more 'ninja - like' aspects of the Sharingan that seem at odds with the Gryffindor values.
One interesting concept could be how Kakashi uses the eternal Mangekyou Sharingan's unique powers in new and unexpected ways. For example, he might be able to create more complex illusions or have enhanced teleportation abilities.