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.
One way it could be developed is through a magical accident. Maybe Weiss is trying out a new, powerful spell she doesn't fully understand yet. Her team is nearby, and something goes wrong with the spell's aim or power, and it fatally hits them. This would lead to extreme guilt and self - loathing for Weiss, and the story could then explore how she copes with this tragedy.
It's rather unique. In the original Naruto story, Kakashi is a mentor to Sasuke, and their relationship is complex but not one typically leading to Kakashi killing Sasuke. So in fanfiction, this would be a very out - of - the - ordinary plot that goes against the general character dynamics we know.
In a scenario where Snape is searching for something in his office and has set up some defensive spells. Harry, unknowingly enters the office. Snape's spell backfires and hurts Harry. Snape is horrified as he never intended to harm Harry in his own territory. He then has to take care of Harry and this incident might be a turning point in their relationship, making Snape more cautious around Harry in the future.
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.
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.
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.
This type of fanfiction is very controversial. Naruto represents hope and growth in the series. Kakashi, as his teacher, is supposed to guide and protect him. Having Kakashi kill Naruto would completely disrupt the established character arcs and the overall positive message of the 'Naruto' story. It might only appeal to a very small subset of fans who are interested in exploring extremely dark and alternative scenarios.
One possible plot could be a training adventure. Naruto, Kakashi, and Iruka could go on a special mission to train Naruto further. Kakashi might teach Naruto some new and advanced ninja techniques, while Iruka could offer moral support and his own knowledge of basic ninja skills. They could face a new and dangerous enemy, and through their combined efforts, Naruto could learn important lessons about teamwork and self - improvement.
In Naruto's world, Naruto killing Team 7 is a very dark and out - of - character concept. However, in fanfiction, it might be possible if Naruto was somehow corrupted. Maybe he was influenced by a powerful and evil force that twisted his mind and made him turn against his closest friends. But this goes against everything Naruto stands for in the original series.