One way this could be possible in fanfiction is if there was a misinterpretation of a prophecy. The prophecy could have been thought to mean that Naruto and Itachi's union was necessary for the greater good of the ninja world. So, the ninja villages pushed for their marriage. And as they spent time together, they found common ground in their desires to protect their loved ones and the villages. Naruto's determination and Itachi's self - sacrifice could have been the foundation for their relationship to grow into a marriage.
Well, in fanfiction, anything can happen. It could be that an alternate reality was created where Naruto and Itachi's personalities were slightly different. Naruto might have been more understanding of Itachi's past actions and Itachi could have seen Naruto as a source of hope in a different light. This change in perception could lead to them developing a relationship and eventually getting married. It's all about exploring different character dynamics that the original story didn't show.
In a fanfiction context, it could be possible through some creative plot devices. Maybe a powerful jutsu was used that altered their memories or destinies. For example, a rogue ninja with a forbidden time - bending jutsu made them believe they were in love and got married. It could also be due to some sort of political alliance gone wrong in a strange way, where they were forced into a marriage - like situation and over time, developed real feelings for each other.
Well, in a really dark and twisted fanfiction, Sasuke could be under some sort of mind - control spell. The spell could be so strong that it overrides his feelings for Naruto. He might then attack and kill Naruto without fully realizing what he's doing. But in the real Naruto lore, their friendship and mutual respect are so strong that this is highly unlikely.
In fanfiction, the idea of Naruto being Itachi's half - brother might be based on some creative reinterpretation of the clans. Suppose there was a long - lost connection between the Uzumaki and the Uchiha clans. This could potentially lead to a situation where Naruto and Itachi share a half - brother relationship. However, it's important to note that this goes against the canon story. The beauty of fanfiction is that it allows for these kinds of 'what - if' scenarios.
In fanfiction, the idea of Naruto having a son with Itachi might be part of a complex AU (alternate universe). The story could set up a world where the Uchiha and Uzumaki clans have a different relationship. Itachi, instead of following his original path, gets involved with Naruto in a way that leads to the birth of a son. This could be due to political alliances, or a new prophecy in this alternate Naruto universe that binds their fates together.
Well, in the official Naruto universe, it's highly unlikely. Naruto and Itachi come from different clans and have very different relationships within the story. Naruto is focused on his own goals and relationships like with Hinata, and Itachi has his own complex story with Sasuke. However, in the world of fanfiction, anything can be made possible as it allows for creative interpretations and alternative storylines that deviate from the original canon.
Well, one way could be if Naruto has some new, super - powerful jutsu that he's developed. Maybe he's found a way to combine his Sage Mode with his Nine - Tails chakra in a completely new and unexpected way that gives him an edge over Hashirama.
It's not really possible within the normal Naruto lore. But fanfiction is all about exploring 'what ifs'. In a yaoi fanfiction where Naruto brings Itachi back to life, it could be based on some extreme emotional bond. Maybe Naruto discovers a hidden power within himself that he can use to reverse death. But this goes against the established rules of the Naruto world where death is usually final. So, it's really a matter of the author's creativity and how they can justify such a huge event within the framework of the Naruto world, even if it's a yaoi - inspired take on it.
In this 'madara kills naruto fanfiction', the scenario might be set up in a way that the world around them has changed. Maybe there are new rules in the ninja world that Madara has adapted to better than Naruto. He could be using the political or social situation to his advantage. Additionally, the writer may have given Madara a different motivation that makes him more ruthless and determined to kill Naruto, and through a series of carefully crafted events, he manages to achieve this goal.
Well, in a fanfiction, the writer can bend the rules of the original Naruto universe. Maybe Kabuto could kill Naruto if he somehow got hold of a super - powerful and unexpected weapon or jutsu that nullified Naruto's abilities.
One possible plotline could be that they got married to form an alliance between two powerful factions secretly. Another could be that they fell in love while on a secret mission together that no one else knew about. Maybe Itachi was on a mission to protect Naruto from afar and they developed feelings over time.
It could be possible in fanfiction. Maybe Naruto discovers a different side of Anko that he's attracted to. They might get married secretly to avoid the chaos that would ensue in the village due to their unexpected union. But in the real Naruto storyline, their relationship is not at all hinted at in that way, so it's purely a fan - created idea.