One possible reason could be for the protection of the village in a very extreme and controversial way. Minato might think that Naruto's presence is attracting too much danger and decides to banish him to keep the village safe.
In some fanfiction scenarios, it could be related to Naruto's power. If Naruto has some uncontrollable power that Minato fears could cause great destruction, he might choose to banish Naruto. This could also be tied to some prophecy or hidden knowledge that Minato has, making him think that banishing Naruto is the only way to prevent a catastrophe.
One possible reason could be for Naruto's protection. Maybe Minato knew of some great danger that was coming for Naruto and he thought that banishing him would keep him out of harm's way. Another reason might be related to some prophecy or hidden power within Naruto that Minato feared could be misused if Naruto stayed in the village.
One possible reason could be fear. If Naruto was 'godlike' in this fanfiction, his power might be uncontrollable and Minato, as Hokage, might feel it's a threat to the village. He could think that Naruto's power could attract too many dangerous enemies or cause destruction accidentally.
One reason could be guilt. Since Minato wasn't there for Naruto when he was growing up in the original story, in the fanfiction, he might be overcompensating for that lost time. He feels like he has to make up for all those years he wasn't around to protect his son.
It could be that Naruto is trying to prove himself. He wants to show that he can be as great a fighter as his father. Also, he might have received some training or knowledge transfer from someone who knew Minato well. This could have inspired him to adopt Minato's fighting style. He may also be in a situation where his normal fighting style isn't working, so he turns to Minato's as a last resort.
Well, perhaps the writer wants to break the mold of the traditional Naruto story. In the original, Minato is a great father figure, but in this fanfiction concept, the writer might be aiming to show how an alternate reality could shape Naruto. Maybe they want to explore themes of trauma and how Naruto could overcome it. Or it could be a way to experiment with different character dynamics, seeing how Naruto would interact with a Minato who is not the loving father we expect. It could also be a form of creative exploration of the characters' personalities, pushing the boundaries of what we think we know about them.
One possible reason could be for Naruto's protection. Maybe she thought by banishing him from a certain place or situation, she could keep him away from a hidden danger that she knew about. For example, there might be a powerful enemy targeting Naruto specifically, and she believed that by making him leave, he would be harder to find.
Maybe in the fanfiction, there were some political motives. Hiruzen might have been pressured by other hidden villages. They could have threatened Konoha if Naruto, as the Nine - Tails' jinchuriki, remained in the village. So, to avoid a potential war or conflict, Hiruzen made the difficult decision to banish Naruto. Also, it could be due to a misunderstanding. Naruto might have been in the wrong place at the wrong time during an incident, and Hiruzen misjudged the situation.
One possible reason could be his high - pressure job as Hokage. He might be so preoccupied with village affairs that he doesn't notice how his actions or words are affecting Fem Naruto. For example, he might cancel a promised training session with her because of an emergency meeting.
Well, it could be that they find out some 'dark secret' about Naruto. Maybe they think he has some sort of uncontrollable power within him that they fear. Or perhaps they are forced to disown him due to political pressure in the village. There could be a group of elders or powerful clans that demand it in order to protect their own interests or maintain the so - called 'balance' in the village.
One possible reason could be the author's desire to create a more complex and controversial story. By making Naruto an illegitimate child, it adds a whole new layer of drama and mystery to his character.