It could be that Naruto's pursuit of power to protect the village takes a dark turn. He delves too deep into a dangerous form of jutsu or power source. This causes him to become unstable and a threat to those around him. His friends are forced to distance themselves from him for the safety of the village. Naruto, realizing what he has become, goes into self - exile. There, in a desolate place, he finally meets his end, all alone.
In this kind of fanfiction, one possible plot could be that Naruto loses all his friends due to some unforeseen and tragic events. Maybe he makes a great sacrifice to save the village, but in the process, he becomes estranged from everyone. His friends might misunderstand his actions, or he could be cursed in a way that drives people away. Eventually, he dies alone, with his heroic deeds forgotten by most.
Perhaps Naruto is framed for a crime he didn't commit. As a result, the villagers turn against him once again, just like in his childhood. His friends try to defend him at first, but as the evidence seems to stack up, they start to have doubts. Naruto, feeling betrayed, decides to leave the village. He wanders alone in the world, facing many hardships and enemies. In the end, he succumbs to his injuries or an enemy's attack, dying alone.
In this fanfiction, it could be that Naruto's death as a baby is the result of a conspiracy. Maybe some anti - Uzumaki or anti - Jinchuriki group within Konoha planned his death. This would then lead to a series of events where the truth is slowly uncovered by some of the more perceptive characters in the village. This could create a lot of internal conflict as characters have to choose between loyalty to the village and uncovering the truth about Naruto's death.
One possible plot could be that Naruto dies heroically in a great battle against a powerful enemy. Then, he is reborn into a world that is very different from his own. He might retain some of his past memories, which help him to quickly gain strength and knowledge in this new world. He could use his new - found situation to prevent the same tragedies that occurred in his previous life.
In this fanfiction, Naruto's death could be a sacrifice. As a hollow, he could start off being very confused. His ninja skills might be warped in this new form. For example, his Rasengan could turn into some sort of dark energy blast. He might also meet other characters from the Naruto world who have also had strange after - deaths, and together they try to find a way to either move on or return to their normal state.
One possible plot development could be that the Hidden Villages struggle to maintain peace without Naruto's influence. His death might lead to power vacuums and political unrest. For example, some villages may try to take advantage of Konoha's weakened state. Another aspect could be how his friends and family cope. His wife, Hinata, might have to raise their children alone, and his friends like Sasuke would feel a great sense of loss and perhaps guilt for not being able to protect him. The ninja world as a whole could also lose its hope symbol, and new, darker forces might emerge, thinking that without Naruto, they can carry out their evil plans more easily.
One possible plot could be that Naruto and Kakashi are in a fierce battle against a powerful enemy. Kakashi is about to be fatally attacked when Naruto jumps in front of him and takes the hit. As Naruto is dying, he might have some final words for Kakashi, perhaps about the importance of protecting the village and their friendship.
Some fans would be very disappointed. Naruto is a character that represents hope and friendship in the original series. So seeing him die alone in a fanfiction goes against the positive themes of the original. They might not like this dark take on the character.
Perhaps Naruto is poisoned by a powerful new villain. His parents are revived just in time to see him succumb to the poison. This event could trigger a series of events where his friends and the entire village vow to avenge his death. His parents might then decide to stay in the living world to help in this quest for vengeance, despite the rules of the afterlife.
One possible plot could be that Fem Haku has some sort of unique ability or knowledge that is crucial for the safety of the Hidden Leaf Village. Naruto and Fem Haku are being pursued by an evil organization that wants to stop her from reaching the village. Along the way, they face numerous obstacles and battles. In a final showdown, Naruto realizes that the only way to ensure Fem Haku's survival and the safety of the village is to sacrifice himself. He gives his life to protect her, and Fem Haku then has to deal with the consequences of his death, like facing the villagers who may blame her, and also has to figure out how to use her abilities to protect the village on her own.
One possible plot could be that Naruto sacrifices himself to protect Sakura from a powerful enemy. Maybe he uses a forbidden jutsu that drains his life force but saves her from certain death. Sakura would be left in shock and grief, and this could lead to her seeking revenge against the enemy or trying to find a way to bring Naruto back, perhaps through some ancient ninja magic.
One possible scenario could be that Naruto was severely injured in a battle, perhaps against a powerful new enemy. He was brought to the hospital, but his injuries were too grave to be healed, and he passed away surrounded by his friends and family, leaving everyone in deep sorrow.