One possible plot twist could be that Naruto has an inner struggle with the dark power of Sauron within him. Since Naruto is known for his positive energy in the original series, having this dark influence could lead to moments where he almost succumbs to evil but his friends' love and his own willpower pull him back.
Perhaps the plot could involve Naruto being hunted by those who know of his Sauron lineage. They fear he will bring destruction like Sauron did. This would put Naruto in a position where he has to constantly prove he is different from his supposed ancestor, and he might have to find a way to sever the connection to that dark heritage.
A really interesting plot twist could be that the world of Naruto and Middle - earth somehow merge. Naruto, as a descendant of Sauron, is seen as a key figure in this new world. He has to use his Naruto - like skills, like shadow clones and Rasengan, along with any new powers he might inherit from Sauron, to either save or destroy this merged world. And his friends from the Naruto world have to figure out how to deal with this new Naruto who has such a dark origin.
One interesting plot twist could be that Naruto's friends initially think he's been possessed by an evil force and try to stop him, but later find out that he's actually the key to saving the world from a greater, hidden threat related to Sauron's power. Another twist could be that the Akatsuki are somehow connected to Sauron's minions from Middle - earth, and Naruto has to team up with some unlikely allies to defeat them.
One possible plot could be Naruto discovering his connection to Tobirama. Maybe he uncovers some long - hidden jutsu or knowledge that was passed down from Tobirama within his family. This newfound heritage could give him an edge in battles against new and powerful enemies. For example, he might learn some unique water - style jutsu that Tobirama was famous for and combine it with his own Rasengan techniques to create a whole new attack.
It could be a story of redemption. The descendant, aware of the Uchiha's dark past, might strive to change the perception of their clan. They could use their skills, which are a blend of Izuna's legacy and their own unique growth, to bring peace between the Uchiha and the other ninja clans. This would involve a lot of character development as they face internal struggles and external challenges along the way.
The fanfiction might explore the concept of a Naruto character being a descendant of Sparda in many ways. For instance, the character could have a special form or transformation similar to Dante's devil trigger in the Devil May Cry series (since Sparda is from that). This form could give them enhanced strength, speed, and abilities. They could also face challenges related to their dual heritage, like being shunned by some in the Naruto world who fear the unknown powers. And the story could revolve around how they overcome these prejudices and prove themselves as a valuable asset to their comrades and the entire ninja community.
Well, it could be about a character who is a descendant of Muu having some sort of special powers that Naruto discovers. Maybe they team up to fight a new threat in the ninja world.
Well, it could be about a character in the Naruto universe who is a descendant of someone named Nero. Maybe this descendant has some unique powers or abilities that come from Nero's lineage. They might face challenges in the ninja world due to their different heritage.
Well, it could be about the main character having special powers inherited from Hagoromo. Maybe they have to face new threats that only someone with Hagoromo's blood can handle.
Well, it could be about a character in the Naruto world who discovers they have some connection to Hiei. Maybe they inherit his powers like his speed or his ability to use the Jagan eye. They could then face challenges in the Naruto universe while trying to master these new powers and keep their identity a secret.
Well, it could be about a Naruto character having the powers or lineage related to Gilgamesh. Maybe they inherit Gilgamesh's arrogance and vast treasure of weapons. They might use these new - found powers in battles against the Akatsuki or in the Ninja World Wars, changing the whole power dynamic in the Naruto universe.
Well, it could be about a character in the Naruto world who discovers they have a connection to Alice. Maybe they have some of Alice's abilities like being able to traverse strange, dream - like dimensions. This could lead to all sorts of adventures, like using these newfound powers to fight against powerful foes in the Naruto universe who are not used to such strange abilities.