The impact would be far - reaching. Naruto's actions of killing Orochimaru and the Akatsuki would send shockwaves through the ninja world. Politically, the relationships between the villages would need to be re - evaluated. Some villages might see Naruto as a symbol of hope and a unifying force, while others might be jealous of the Hidden Leaf for having such a powerful ninja. Economically, the trade routes that were affected by the Akatsuki's activities would start to normalize. Socially, the fear that the Akatsuki had instilled in the common people would start to fade away. However, Naruto would also have to deal with the moral implications of his actions, especially if he had to use extreme means to kill them.
It could have a major impact on the power balance. With Orochimaru gone, many of his secret experiments and knowledge could be lost or fall into the wrong hands. Naruto, being 'godlike', might be seen as the new power to keep in check. His friends and allies might start to distance themselves out of fear or respect for his new power level. The Akatsuki, too, would need to re - evaluate their plans as one of their potential allies or threats (depending on Orochimaru's relationship with them at the time) is no longer in the picture.
Well, perhaps in the fanfiction, Naruto kills Orochimaru and the Akatsuki, but it turns out that Orochimaru had a failsafe. His death triggers a powerful curse that starts to affect Naruto and the Hidden Leaf Village. Naruto then has to find a way to break this curse while also dealing with the remaining threats that were associated with the Akatsuki. It could be a race against time to save the village and himself.
Well, in some versions, Naruto might use his new and improved Rasengan techniques. He could have combined it with his Sage Mode powers to overpower Orochimaru. Maybe he also uses his quick thinking and the element of surprise, since Orochimaru is always so full of his own schemes.
In some fanfics, Naruto might use his new and powerful jutsu that he has mastered over time. Maybe he combines his Sage Mode with the power of the Nine - Tails in a unique way that Orochimaru can't counter. For example, he could use the Nine - Tails' chakra to enhance the range and power of his Sage Mode attacks, and then catch Orochimaru off - guard.
In a fanfic where Orochimaru kills Naruto, the plot would take a very different direction. Naruto was the Jinchuriki of the Nine - Tails, and his death would mean the Nine - Tails' power is lost. Orochimaru might try to take over Konoha or use Naruto's death to gain some other advantage. The other ninja villages might see Konoha as weak and attack. His friends would have to deal with the grief and might turn to different paths, some perhaps darker in their search for meaning after such a loss.
Yes, it can be quite a common theme. Many Naruto fans like to explore the idea of Naruto taking on the powerful Akatsuki members and defeating them in their own fan - created stories. It allows for a lot of creative freedom in terms of the battles, the power - ups Naruto might get, and the overall plot development.
Many of Naruto's friends and allies would be filled with rage. Characters like Sasuke would probably seek immediate revenge on Kawaki. The other villages might also see this as a sign of instability in the Hidden Leaf and could either try to take advantage or offer help depending on their relationships with the Leaf. And the younger generation, like Boruto, would be deeply affected. He would have to deal with the loss of his father and might struggle with his own identity and purpose in a world without Naruto.
The villagers would likely be in shock. Naruto is a beloved figure, but killing his own son would be a very controversial act. Some might turn against Naruto, believing he has gone too far. Others might understand his reasons if they knew the full story, but still struggle with the morality of it.
It might inspire other writers in the community. Some might see it as an opportunity to fill the gap and start creating their own unique takes on Naruto - related stories. For example, new writers could emerge trying to recreate the kind of stories the 'quitting' writer used to write.
Finally, adapt to the changing ninja world. Orochimaru has lived through different eras. Use his experience to anticipate future trends in the ninja world. For example, if there is a growing need for medical ninjas, use his knowledge of the human body to pivot towards that area, not only for survival but also to gain respect and influence in the ninja community.