One interesting plot could be that Naruto gets the two tomoe sharingan during a time - travel arc. He travels back in time and somehow gets the sharingan, and then has to use it to change the future for the better. He could use the sharingan's abilities to influence key events and characters in the past, like preventing some of the tragedies that happened to the Uchiha clan. This would also involve him having to hide his true identity from the people of the past while still trying to achieve his goals, which would create a lot of interesting situations and conflicts.
A possible plot could involve Naruto getting the two tomoe sharingan and being mistaken for an Uchiha by some villains. They then try to either recruit him or kill him because of the power he now holds. This could lead to Naruto having to prove that he's still the same Naruto while also dealing with the new power and the threats that come with it. He might also have to find a way to get rid of the sharingan if it starts to cause problems or change him in a negative way.
Yes, there are quite a few. You can start by looking on popular fanfic websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto two tomoe sharingan' and you'll find a variety of stories with different plots and interpretations. Some might focus on Naruto getting the two tomoe sharingan through some unique means, while others could explore how it changes his abilities and relationships within the Naruto universe.
Maybe in the fanfic, Naruto enters an alternate dimension where the Sharingan is blue. He discovers that he has this new - found ability and must use it to find his way back home. Along the way, he meets different versions of his friends and foes, and the blue Sharingan gives him an edge in battles and also helps him understand the secrets of this strange dimension.
Perhaps the plot could involve Harry inheriting the Sharingan from a long - lost relative who had some connection to the Naruto universe. With the Sharingan, he can perceive things that normal wizards can't, like the flow of magic in a more detailed way. He might use this to develop new spells or to understand the nature of magic better. And in battles, he could use the Sharingan's abilities like predicting his opponents' moves and copying spells, which would give him a huge advantage against the Death Eaters and other foes.
One possible plot could be that Naruto discovers the Sharingan during a mission in a hidden part of the shinobi world. He then has to learn how to use it while keeping it a secret from his friends and enemies. As he masters it, he gains new insights into the Uchiha clan and their history.
One possible plot could be that Naruto discovers he has the ultimate Sharingan through some mysterious means. Maybe it was a hidden power passed down in his family that was dormant until a certain event triggered it. Then he has to learn to control this new power while still using his own unique ninja skills.
Well, the plot could involve a character who has both the Sharingan and the Rinnegan. Maybe Naruto somehow gains the Rinnegan in addition to his own powers. He could use the abilities of the Sharingan, like predicting movements and copying jutsus, along with the Rinnegan's power to control the six paths. This would create a really powerful and unique situation in the Naruto universe. He might face new enemies that are only a threat to someone with such combined powers.
A fanfic plot where Danzo gives Naruto Sharingan could start with a life - or - death situation. Danzo sees Naruto as the only hope and gives him the Sharingan to give him an edge. Naruto then has to quickly adapt to the new power. As he does, he starts to have visions related to the Uchiha's past through the Sharingan. These visions lead him on a quest to uncover the truth about the Uchiha massacre and Danzo's role in it. This could lead to a conflict within the village as Naruto uncovers dark secrets and has to decide what to do with the knowledge and his new - found power.
Another plot twist could be that Naruto getting the Sharingan is part of a much larger conspiracy. The Akatsuki might be behind it, trying to create a super - powerful being that they can control. So Naruto has to figure out who's behind this while also dealing with the new power. He might find that there are some hidden motives among his own allies as well, which would really shake up the story.
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, if Naruto has Obito's Sharingan in a fanfic, it could lead to some really interesting power combinations. Naruto already has his own strong chakra and abilities like the Rasengan. With the Sharingan, he might be able to copy jutsus even more effectively. Also, it could change his perception of the Uchiha and the whole situation regarding the Sharingan's history in the Naruto world. Maybe he could use it to understand Obito's motives better.