One way it could be developed is through extreme despair. Maybe Naruto fails to protect the village from a new and overwhelming threat. He blames himself so much that he starts to think his death would be a solution. For example, if all his friends were killed in the battle and he felt powerless to stop it, he might sink into deep depression and consider suicide as a way to end his pain.
In a Naruto kills Kiba fanfiction, one way it could be developed is through a misunderstanding. Maybe Kiba is framed for a crime against the village that Naruto believes wholeheartedly. Naruto, in his overzealous sense of justice, might attack Kiba without fully understanding the situation. However, this goes against Naruto's character in the original series, so it would require a significant deviation from the canon.
Maybe Naruto is framed by a powerful enemy within Konoha. False accusations are made against him, and instead of getting a fair trial, he is hunted down. This injustice could make him turn his back on the village that he once loved and swore to protect.
Well, one way could be that Padme is from a different ninja village and is on a secret mission. She gets close to Naruto to gain information about Konoha. When she gets what she needs, she betrays him by revealing his secrets or setting him up in a dangerous situation. For example, she could tell his enemies his fighting patterns or the location of his important allies.
In some fanfictions, there could be an alternate reality or a time - travel plot involved. Maybe Kakashi from the future accidentally goes back in time and in the chaos of trying to fix something, he ends up killing Naruto. This would completely change the course of the Naruto - verse. Characters like Hinata, who had feelings for Naruto, would be heartbroken. And the Akatsuki might take advantage of the situation, seeing the Hidden Leaf Village in a state of disarray without Naruto as their potential Jinchuriki and future hope.
One way this could be developed is if Naruto is somehow mind - controlled. For example, an enemy uses a powerful genjutsu on Naruto, making him lose his sense of self and see the Third Hokage as a threat to the village instead of a protector. Then, in his confused state, he attacks and kills the Third Hokage. This would create a huge moral and emotional conflict within the story, not only for Naruto when he comes to his senses but also for the entire village.
In this fanfiction scenario, it could be that an enemy uses some sort of mind - control jutsu on Naruto's family. The family, under the control of this jutsu, doesn't recognize Naruto as their own and kills him. This would add an element of tragedy as Naruto would be killed by those he loves and trusts the most without them being fully in control of their actions. It would also open up the story for a revenge plot by Naruto's friends or other allies against the enemy who controlled his family.
One way this could be developed is by exploring a dark Naruto who has been corrupted by power or some outside influence. Maybe he's been manipulated by an enemy of the Uchiha clan who wants to see them destroyed. This could lead to a series of events where Naruto gradually turns against the Uchiha, believing them to be a threat to the village.
Perhaps his parents were misled to believe that Naruto was a threat to the village. They might have been fed false information about Naruto being a potential danger, like being a vessel for a great evil. So, in an attempt to protect the village they loved, they made the tragic decision to kill him.
The following are some recommendations from ancient novels about rural girls committing suicide: 1. "King of the World: Fourth Master Spoils His Wife": This novel tells the story of the female protagonist punishing the crown prince after her rebirth and helping him together with the male protagonist. The love between the two of them is indistinguishable. 2. "The Story of the Princess 'Reverse Wear": This novel tells the story of an ancient princess who transmigrated to a modern left-behind child. She tried her best to change her fate after a major accident on her wedding night. 3. The story of a foxy concubine who was resented by her mistress and sold to the Qu family village in the remote suburbs as a concubine. Please note that the novels recommended above may only partially meet the requirements. It is recommended to further consult relevant resources for more information.
It's not common, thankfully. The Percy Jackson series is mainly about adventure, friendship, and heroism. Fanfiction should ideally expand on these positive aspects rather than taking such a dark turn. However, some might write it to explore extreme emotional or psychological scenarios, but it's still not a positive trend.