He would likely be seen as a traitor by the village. The villagers, who once saw Naruto as a hero - in - the - making, would now turn against him. He'd be hunted by the ninja forces of Konoha.
The Akatsuki would surely be affected. They would lose one of their members, which could disrupt their plans. Also, it might change the way other characters view Naruto. Some might see him as a more formidable threat, while others might see him as a hero for taking out a dangerous enemy.
The village's morale could take a huge hit. Naruto is a symbol of hope and strength. If he jumps off the monument, it would make the villagers question their own safety and the stability of the village. Politically, it could cause unrest as the village leaders would have to deal with the aftermath and try to keep the situation under control.
Perhaps the Hokage has made a decision that Naruto believes will destroy the village's future. Like if the Hokage decides to sacrifice a large number of innocent villagers in order to achieve a short - term goal. Naruto, with his strong sense of justice, might see killing the Hokage as the only way to stop this madness.
In this fanfiction, Naruto might save the Third Hokage by using his newfound powers. Maybe he taps into a deeper level of his chakra and arrives just in time to fend off the enemy attacking the Third. His determination and growth as a ninja would play a crucial role in this rescue.
One consequence could be a shift in the power balance in the ninja world. If Naruto kills Hanzo, the village that Hanzo was protecting or ruling might be thrown into chaos. His death could also lead to his followers seeking revenge against Naruto or his village.
The concept of Hokage Naruto killing Sasuke goes against the essence of their relationship in the original series. Naruto has always been striving to save Sasuke, to bring him back to the right path. However, in some very niche and edgy fanfictions, this might be explored. But overall, it's not something that is widely embraced. The Naruto fanbase generally gravitates towards positive resolutions of their relationship.
A major consequence is how other characters react. The village elders might treat him differently, perhaps with more reverence or more suspicion. Also, his enemies might see him as an even greater threat. Naruto himself might also feel a greater sense of responsibility towards the village, as he is now connected to its founder in a very special way. This could lead to him making different decisions in battles and in the overall story arc.
One challenge could be mastering difficult jutsus. The Third Hokage might set high standards for Naruto to learn complex techniques, which would be a struggle for him.
If Mizuki kills Naruto in a fanfic, it would likely have a huge impact on the Hidden Leaf Village. Naruto was seen as a symbol of hope, so his death could lead to widespread despair. His friends like Sasuke and Sakura would be deeply affected, perhaps Sasuke would be even more consumed by revenge. Also, the Nine - Tailed Fox inside Naruto would be a major factor. It might go on a rampage or be captured by the wrong people.
If Sasuke kills Naruto in fanfiction, it could lead to chaos in the shinobi world. Naruto is seen as a symbol of hope and peace, so his death would shatter the dreams of many. Villages might start to distrust each other more, and there could be a power struggle as no one as unifying as Naruto is around.