Well, Sasuke would probably be consumed by guilt. He might go on a self - imposed exile or a journey to avenge Naruto. The other characters would start to reevaluate their relationships with Sasuke. Konoha might be in a state of mourning, and there could be a power vacuum. Some might blame Sasuke for Naruto's death, which would add more conflict to the story.
Naruto would be devastated. Sasuke is his closest friend and rival. He would likely go into a state of deep mourning at first. He might isolate himself for a while, just trying to come to terms with the loss.
The Akatsuki might take advantage of the chaos. With the village in disarray due to Sakura's death, they could launch more attacks. The balance of power in the Naruto world would be disrupted. The other villages might also see this as an opportunity to gain an edge over Konoha.
The story could progress in many ways. For one, Sasuke might be filled with guilt for receiving Naruto's eyes. This guilt could drive him to become a better person and fight for the things Naruto believes in. He may also use the new vision to uncover secrets or powers that were previously hidden. On the other hand, Naruto, without his eyes, could develop other enhanced senses or abilities, and together they could form a new kind of partnership. They could also face challenges from those who oppose the idea of Naruto sacrificing so much for Sasuke.
In such a fanfic, the plot could involve a powerful and overwhelming enemy attacking the village. Naruto, being the hero, would fight with all his might. He might sacrifice himself by using a powerful jutsu that could stop the enemy but cost him his life. His death would leave the village in mourning, and his friends like Sasuke, Sakura, etc., would be deeply affected. They might then vow to carry on his legacy and protect the village even more fiercely in his honor.
The fanfic could explore how the death affects the younger generation in Riverdale. Maybe the kids at school start to form a support group in Betty's name. Or perhaps there are some who try to follow in Betty's footsteps and continue her work for justice, which would create a new dynamic in the town as they face opposition from those who don't want change.
Sasuke would be deeply affected. He and Naruto had a complex relationship. His first reaction might be shock and then a deep sense of loss. He might feel guilty for not being there to help Naruto. Sakura would be heartbroken. She had always cared for Naruto, and his death would be a huge blow. She might become more determined to protect the village in his memory. And Boruto, Naruto's son, would be devastated. He would probably grow up with a strong sense of purpose to live up to his father's sacrifice and protect the village even better.
Sakura would likely be devastated. Naruto has been her friend and teammate for a long time. His death would leave a huge void in her life, and she'd probably go through a long period of mourning.
The Hidden Leaf Village would be in deep mourning. His friends like Sasuke would be filled with a mix of anger and grief. They might vow to protect Naruto's sister in his memory. The village would also probably hold a grand memorial for Naruto, and his story would become a legend to inspire future generations of ninjas.
In a 'kawaki kills naruto' fanfic, the story would likely take a very dark turn. The characters would be forced to reevaluate their relationships and loyalties. Sasuke, for example, would be deeply affected as Naruto was his closest friend. He might be torn between seeking revenge and trying to understand what drove Kawaki to such an act. The new generation of ninja, like Sarada and Mitsuki, would also be involved in the aftermath. They might be caught in the middle of the conflict between Boruto and Kawaki, trying to find a way to restore peace while dealing with their own feelings of loss and confusion.
Sasuke would be deeply affected. He and Naruto had a complex relationship. He might feel regret for not being there to help Naruto and also feel a new sense of purpose in avenging his friend. Sakura would be heartbroken. She had always cared for Naruto, and his death would make her question the purpose of the ninja life. Haku herself would be in a state of shock and disbelief. She would feel a heavy burden of guilt, knowing that Naruto sacrificed his life for her. She might become more withdrawn initially but then use Naruto's memory as a motivation to become stronger.