In this fanfic scenario, Naruto's character could take a darker turn. Maybe he becomes more solitary and distrustful. His sister, on the other hand, might be favored by Kushina but have her own internal struggles. The story could explore how Naruto overcomes his feelings of being abandoned and reconciles with his family.
In a 'Naruto abandoned for his sister' fanfic, perhaps there's a prophecy that only one of them can bring peace to the village. The elders, misinterpreting it, choose the sister and abandon Naruto. Naruto then goes on a journey outside the village, meets new friends and allies, and discovers new powers. Meanwhile, the sister is having her own struggles within the village, like dealing with the pressure of being the 'chosen one' and realizing that Naruto's abandonment might not have been fair.
Naruto's character would be deeply affected. He would feel a great sense of betrayal. His usually sunny disposition could turn into a more cynical one. He may start to question the values of the village he once so desperately wanted to be a part of. However, this could also be the catalyst for him to explore his own identity outside of the village's expectations. He could become more self - reliant and develop a new sense of purpose that is not tied to the village's approval. He might also have a more complex relationship with his sister, feeling both envy and a strange sense of protectiveness towards her, especially if he realizes she was also a victim of the village's decision in some way.
Naruto might start off as a very angry and resentful character. He could be constantly trying to outdo his sister to prove to Kushina that she made a mistake. For example, he could focus on becoming the strongest ninja in the village.
He might feel a great deal of pain and confusion at first. Naruto could start to question his self - worth. Maybe he tries to find out the reasons behind the abandonment on his own, becoming more independent in the process.
I'm not entirely sure as I haven't read this specific fanfiction. But generally, it might be about Naruto who is in a god - like state and is somehow abandoned because of his sister. Maybe there are conflicts within the family or some sort of power struggle related to Naruto's god - like abilities and his sister's existence.
Obviously, Naruto and his sister are the main characters. Naruto is the one with the godlike state, and his sister is the reason for his abandonment in this fanfiction.
Naruto would use his ninja skills. He might start with a diversion, like creating some clones to distract the assassin while he gets his sister to a safer place.
It could be that there was a prophecy related to his sister that made the family think she was more important. For example, a prophecy that she would be the key to saving the village in the future. And in their short - sighted view, they abandoned Naruto to focus all their resources on her.
Naruto would likely become more bitter at first. Without the family support he should have had, he might be more distrustful of others. But as he grows, he could use this as motivation to become stronger. For example, he might train twice as hard as in the original story.