In a fanfiction where time - travel goes wrong. Hinata could be sent to a different time period where she has no support system. She gets caught in the middle of a war that she has no knowledge of. Unable to defend herself properly, she is killed. Naruto, back in the present, then discovers what has happened and tries to find a way to go back in time and change her fate, but it's extremely difficult and full of challenges.
One possible storyline could be in a dark AU (Alternate Universe). Maybe there's a powerful new enemy that targets Hinata specifically because of her connection to Naruto. This enemy could have some sort of vendetta against the Hyuga clan and sees Hinata as the key to their downfall. Naruto is then left to deal with the grief and also find a way to avenge her death, which could lead to a whole new arc of him exploring darker powers or making some difficult moral choices.
Perhaps in a fanfiction where the world is overrun by a deadly plague. Hinata, being one of the front - line medical ninjas in the village, contracts the disease while trying to find a cure. Despite Naruto's desperate attempts to find a way to save her, she succumbs to the illness. This would be a very emotional and tragic story, with Naruto having to come to terms with the loss and also trying to protect the village from the still - spreading plague.
A common scenario in such fanfictions is that Hinata sacrifices herself in a war - torn situation. For instance, in a great ninja war, Naruto is the key to victory but is targeted by the enemy's most powerful forces. Hinata, with her unwavering love for Naruto, jumps in front of a massive attack aimed at Naruto, knowing full well that it will cost her life. This selfless act then serves as a major turning point in the story, inspiring Naruto and his comrades to fight even harder.
Well, in this fanfiction, an ending might be that Hinata, in her grief, leaves the village for a while to find herself. When she returns, she has become stronger and more confident. She then devotes her life to making the village a better place, just as Naruto would have wanted. Another ending could be that the whole village unites even more tightly after Naruto's death, with Hinata at the forefront of this unity, as she was the last person Naruto protected.
Perhaps in this fanfiction, Naruto is fatally injured in a fight during the Chunin Exams. He might sacrifice himself to save one of his friends. This would cause a great outpouring of grief from his friends and mentors. The village would also be in shock, and there could be a change in the power dynamics as his absence leaves a void.
One possible storyline could be that Naruto is framed for a serious crime within the Blood Prison. The corrupt prison system then subjects him to various forms of torture and unfair treatment, which eventually lead to his death. Maybe he was protecting someone else inside the prison and took the fall for a crime he didn't commit.
Another storyline could be that Naruto and Hinata are trying to raise their family while Naruto is Hokage. Hinata might be pregnant, and Naruto is worried about balancing his duties as Hokage with being a good father. He could get advice from his old friends like Shikamaru on how to manage his time better.
One possible storyline could be that Naruto is so focused on his goal of becoming Hokage that he unintentionally ignores Hinata's feelings. He might be constantly training and involved in village affairs, not noticing Hinata's attempts to get closer. For example, Hinata could prepare a bento for him, but he's too busy to even accept it. Another could be that Naruto has some misunderstandings about Hinata and chooses to keep his distance, thinking she has some ulterior motives.
One possible storyline could be Naruto and Hinata's relationship development while Naruto also has a group of friends around him that form a sort of 'harem' situation in a platonic sense. They all support each other and go on various adventures together in the ninja world.
In a fanfiction, Naruto could be depressed because he feels he can't live up to the expectations of the village. Hinata, who has always admired him from afar, decides to step in. She shares her own insecurities with Naruto, making him feel less alone. This mutual understanding leads to them spending more time together. Hinata's gentle presence and unwavering belief in Naruto start to heal his depression, and they eventually fall in love.
One consequence could be Hinata's complete emotional breakdown. She has always been in love with Naruto. His death would shatter her world. She might become withdrawn and lose her will to fight. In the Naruto universe, she is a strong - willed kunoichi, but this event could change her entirely. She could also vow revenge if Naruto's death was due to an enemy, and this could lead her on a dark and dangerous path of seeking vengeance.
In such a fanfiction, one possible plot development could be that Naruto sacrifices himself during a major battle against an extremely powerful enemy. Maybe an enemy that has the power to destroy the entire Hidden Leaf Village. Naruto, being the hero he is, steps in to protect Hinata and in the process, takes a fatal blow meant for her. This would lead to great sorrow among the villagers, especially Hinata who would be heartbroken. She might then vow to carry on Naruto's will and protect the village in his memory.