I can't provide any content that involves political sensitive topics or violates ethics. At the same time, according to the relevant laws and regulations, I cannot provide any novels or articles related to violence, sex, horror, and other content.
I strongly recommend Naruto in One Piece World to you. It tells the story of a college student who likes to watch movies, anime, and play games. He transmigrated into the Naruto world and became a villain. He didn't have a cheat code, but he relied on the Naruto storyline that he was familiar with. He dodged the attacks of the main characters in one disaster after another and finally became an elite Chuunin. However, in the end, he was actually killed by Nine-Tailed's big butt when he attacked the village. What was even more deceptive was that he had transmigrated to the world of One Piece and had a speechless system. The plot of this novel was wonderful, and the characters were vivid. It was very worth reading. I hope you like this fairy's recommendation. Muah ~😗
I think Orochimaru could also fit the bill. His experiments on himself and others are really out there. He's constantly looking for ways to gain more power and immortality in some really strange and unethical ways. His snake - like features and his ability to shed his skin like a snake add to his quirkiness. He's not your typical, straightforward villain and has a lot of idiosyncrasies that could be played up in a fanfiction.
Kaguya could be an interesting choice. She is extremely powerful and has a complex backstory. Her motives were initially self - serving and evil. If she were somehow resurrected or a situation where Naruto had to interact with her in a different time - line, it could make for a great fanfiction. Naruto's ideology of peace and friendship could clash and then potentially influence her.
Villain Naruto fanfics change the Naruto universe by reversing the role of Naruto. Instead of being the hero, he becomes a source of conflict. This alters the power dynamics in the story. For instance, the relationships he had with his friends like Sasuke and Sakura are completely transformed. They may now be enemies or at least have a very strained relationship.
Power corruption is a common theme. Just like in many stories where Naruto turns into a villain, it often starts with him getting too much power too quickly and it corrupts his ideals. Another theme is betrayal. For example, if he's betrayed by the village, he might turn to the dark side.
One interesting 'villain Naruto fanfic' could be one where Naruto is turned against the Hidden Leaf by a powerful curse. In this kind of fanfic, Naruto's personality might be distorted, and he uses his powerful jutsu against his former comrades. Another could be a fanfic where Naruto teams up with Orochimaru for some dark purpose. They might plan to take over the ninja world in a more sinister way compared to the original story.
First, decide on their backstory. Maybe they had a rough childhood in one of the hidden villages that led them to turn bad. For example, if they were from the Hidden Leaf, they could have been shunned for not having strong ninja skills initially. Then, design their appearance. They might have a unique hair color or style, like long white hair to give an air of mystery. Also, think about their abilities. It could be a special jutsu related to shadows or something that's not commonly seen in the Naruto world.
Isolation is also a theme. Naruto has always craved acceptance. If he is pushed into a corner and isolated completely, he may turn to villainy. He might think that if the world won't accept him as he is, he'll make the world fear him. This theme can explore the psychological effects of loneliness and rejection on a character as powerful as Naruto.
Maybe an ancient evil spirit that has been awakened due to some mistake. It targets Ageha because she has a pure and powerful chakra. Naruto, being the hero he is, tries to fight the spirit, but he quickly realizes that he needs Ageha's help as well as the help of all his friends to defeat this powerful foe.