It could be a variety of villains. Maybe some of the traditional Naruto villains like Orochimaru or Pain could be in the story and Naruto kills them. Or perhaps in this fanfiction crossover, there are new villains created that are a combination of Naruto - style threats and Justice League - type menaces. It's hard to say exactly without reading the fanfiction, but it would be interesting if it included some well - known Naruto baddies being taken out by Naruto in a new setting with the Justice League around.
The villagers of the Land of Waves would surely support Naruto. They have suffered a great deal under Gato's rule, so they would see Naruto as their savior. Also, Sasuke might support Naruto. Even though they have their differences, Sasuke would recognize the need to stop someone as evil as Gato.
He might kill an enemy shinobi from another village. For instance, if there is a particularly aggressive and cruel shinobi from the Sand Village during the Chunin Exams who poses a great threat to Naruto's friends or the Leaf Village in general, Naruto could be forced to kill him in self - defense or to protect others.
One consequence could be a shift in the power balance among the ninja villages. Since Orochimaru was a powerful and feared figure, his death might cause some chaos as his former allies or subordinates try to either avenge him or claim his resources. For example, some of his secret labs and experiments might be up for grabs, leading to potential conflicts.
The ANBU black ops could also play the role of antagonists. They are the ones who carry out the village's more secretive and sometimes morally gray missions. If they are ordered to hunt Naruto down unjustly, they would be in Naruto's way and could be the reason for his violent reaction towards Konoha.
Kakashi could be a significant supporting character. He could provide Naruto with some advice or even join the battle alongside Naruto for a while. Another possible supporting character could be Hinata. Her gentle presence and belief in Naruto could give Naruto the extra motivation he needs during the fight.
It could be an original character created just for the fanfiction. Many fanfiction writers like to introduce new characters to add their own unique twists to the story.
No, it doesn't seem to be a common concept. Usually, Naruto fanfiction focuses on various aspects like character development, new relationships, or different story arcs that are more in line with the general themes of the original series, which is not mainly about 'kills'.
I don't think 'naruto kills fanfic' is a widely popular type of Naruto fanfiction. While there are always fans who like to experiment with different ideas and darker plotlines, the overall Naruto fandom seems to be more centered around the positive aspects of the series such as Naruto's journey to become Hokage, his friendships, and his growth. However, there could be a small group of fans who are into this kind of more extreme or alternate - universe type of fanfiction.
No, it's not popular. In the Naruto fandom, most fans are interested in fanfiction that expands the Naruto world, gives more depth to characters, or creates interesting crossovers. A concept like 'naruto kills fanfiction' goes against the spirit of the fandom which thrives on the creation and sharing of fan - made stories.