In some fanfiction, Naruto might seek revenge on his family if he finds out they have a dark secret that goes against his values. For instance, if he discovers that his family was involved in some unethical or cruel actions in the past. However, this would be a huge departure from the Naruto we know in the original series, as he is usually very forgiving. But in the realm of fanfiction, anything can be explored. Also, it could be a situation where Naruto believes his family has been hiding their true identities from him, and these identities are associated with something he despises.
In the fanfiction, Naruto might think his family abandoned him on purpose. So, he starts to seek revenge. He could train hard to become extremely powerful. Along the way, he meets some people who try to convince him that revenge is not the answer. But his anger is so strong that he doesn't listen at first. Eventually, he might come across some evidence that shows his family had no choice but to leave him, which makes him question his revenge mission.
It would create a huge shockwave. Naruto is a central figure, and his actions towards his family would change the dynamics of all his relationships. His friends would be deeply divided. Some might try to stop him, believing there must be a misunderstanding, while others might be swayed by Naruto's determination. The ninja villages would also be affected. Konoha, in particular, would face an internal crisis as Naruto is one of its most important assets. His revenge could lead to a split in the village, with some supporting Naruto and others standing by his family.
During his revenge journey, Naruto might learn new skills not just in ninjutsu, but also in terms of strategy and manipulation. He could start using his wits more than his brute strength. This shows his growth from a simple - minded fighter to a more complex thinker. He might also start to understand the darker side of human nature, which makes him more cautious in his relationships.
It could be some hidden members of Naruto's family itself. Maybe there are relatives who have been manipulating things from the shadows and their actions led Naruto to believe he needs to take revenge on the family as a whole.
Sasuke is often one of the characters. Given their complex relationship, Sasuke might see Naruto's banishment as another wrong done by the village and decide to support him in his revenge, especially if it means taking on the village's corrupt elements.
One possible reason could be that his newfound 'godlike' powers make his family feel estranged. They might not understand his sudden transformation and the magnitude of his power, which creates a sense of fear or discomfort, leading them to ignore him.
He could also distance himself from them. Naruto might choose to avoid his family, not wanting to be around them as a way to show his anger. He could move out or stop participating in family activities.
One possible reason could be that the family feels wronged by Konoha's political decisions. Maybe they were unjustly targeted or their clan was persecuted in some way by Konoha's leadership. For example, if their clan was blamed for something they didn't do and faced severe sanctions as a result.
Maybe he has some personal grudges or misunderstandings within the family in the fanfiction. It could be that something happened in the past that made him feel betrayed or unappreciated, so he refuses to offer help.