His mother, Kushina, might also be an opponent. For instance, if an enemy uses her strong chakra against her will, Naruto could end up in a situation where he has to face her in combat. She has a powerful temper and if manipulated, could be a formidable foe for Naruto.
His father, Minato, could be one. Maybe there's some time - travel or alternate reality situation where Minato has been corrupted in some way and Naruto has to fight him to set things right.
His son, Boruto, from a future - set fanfiction could be an opponent. There could be a rift between them due to different ideals or perhaps Boruto is under some kind of mind control, forcing Naruto to fight his own son.
He would most likely meet his parents, Minato and Kushina.
His father, Minato, could be a likely candidate in a really dark fanfiction. Maybe he was resurrected in an imperfect way and his mind was warped, causing him to turn on Naruto.
One possible plot could be that Naruto is mislead into believing his family has been possessed by some dark force. So, he has to fight them to free them. For example, an evil ninja might use a genjutsu on his family members, making them act against Naruto's will.
Well, in fanfictions, often the plot takes a different turn. Naruto might hide from his family because there could be some sort of misunderstanding. For example, there could be false rumors about him being involved in something bad. And he might think that his family would believe those rumors without giving him a chance to explain. So, to avoid the immediate confrontation and judgment, he chooses to hide.
One possible opponent could be a new, self - created villain in the fanfiction world. This villain might have abilities that force Naruto to use wires in a creative way to fight, like being able to phase through solid attacks.
The elders of his family or clan could be the main antagonists. They might have exiled Naruto in the first place due to some old - fashioned beliefs or fear of his power. Throughout the fanfiction, they could try to stop Naruto from finding out the truth or coming back to the clan.
His father might be extremely disappointed. As a former Hokage, he would have expected Naruto to uphold the family's honor. His mother would probably be heartbroken, having always believed in Naruto's good nature.
He would most likely meet his father, Minato Namikaze, and his mother, Kushina Uzumaki. These are the two main family members he never really got to know growing up.
His mother, Kushina, could also be part of the family that wants him back. She was a kind - hearted and strong - willed woman. If she were alive in the fanfiction, she would be desperate to have her son with her. She would want to protect Naruto and share all the things she didn't get to when he was growing up, like teaching him about their Uzumaki heritage.
However, it could also have negative impacts. He might start to feel lonely and bitter, which could lead to him making some bad decisions. He could be more easily influenced by the wrong people or ideas because he lacks the grounding that his family usually provides. Also, his relationships with his friends might become strained as he tries to keep them at a distance too, thinking that they'll side with his family.