Naruto's reaction could be complex. He would feel a deep sense of loss and loneliness. But he has the spirit of never giving up. He might start to question the concept of family and what it really means. This self - reflection could lead him to grow as a person. He could also become more empathetic towards others who have been rejected or abandoned. In his journey, he might encounter people who have similar experiences, and together they would form a bond and support each other while he tries to find his place in the world without his family.
Another storyline could involve Naruto uncovering a dark secret within his family that led to his disownment. As he digs deeper, he realizes that there were misunderstandings and forces at play that he needs to confront. This could lead to a complex and emotional journey of reconciliation or acceptance of his new situation.
Naruto would likely become more independent. Without the support of his family, he'd have to rely on himself more. He might develop a tougher exterior and be more cautious about who he trusts.
One possible reason could be his status as a Jinchuriki. In the Naruto universe, being a Jinchuriki is often seen as a curse and a threat. His family might be afraid of the danger it brings to them and the village, so they disown him. Another reason could be political. Maybe there are some power - hungry individuals in the family who see Naruto as a liability to their power - grabbing plans.
It could be related to some prophecy or superstition within the clan. They might think Naruto is a bad omen or something that goes against their traditional beliefs, so they decide to disown him.
Naruto could start to focus more on building relationships outside of his clan. He would seek acceptance from his friends like Sasuke, Sakura and Kakashi. Their support would give him the strength to rise above the situation. He might also start to explore different jutsu and skills on his own, without relying on any clan teachings.
It could also be due to a prophecy. Suppose there's a prophecy that Naruto will bring great disaster in the future. His parents, believing in the prophecy, might decide to disown him in an attempt to avoid that future. They might think that by cutting ties with him, they can somehow change the course of events.
In fanfiction, Naruto could be disowned by his father because of secrets. Suppose his father had some dark secrets in his past that Naruto unknowingly got involved with. His father might disown Naruto to keep those secrets buried. Or perhaps Naruto's father was under the influence of some dark magic or mind - control that made him act against his normal feelings for Naruto. It could also be a case of a prophecy that led his father to believe Naruto was a threat to the village in the future, even if there was no real evidence yet.
Naruto might initially be heartbroken. He has always longed for his father's love and acceptance, so being disowned would be a huge blow. He could go into a state of depression for a while, withdrawing from his friends and normal activities. But then, Naruto is a fighter. He would likely start to question his father's decision and try to find out the real reason behind it, vowing to prove himself worthy if there was some misunderstanding.
Naruto would probably become more independent. Without his parents' support, he has to rely on himself. He might start to train harder to prove himself to everyone.