It could be that Kushina is forced to leave Naruto because of some political intrigue in the Hidden Leaf Village. Naruto, being left alone, has to face the challenges of growing up without a mother figure. This absence shapes his relationships with his friends and mentors in different ways. For example, he might be more eager to seek father - like figures among his teachers.
Perhaps in this fanfiction, Kushina leaves due to some sort of danger she doesn't want Naruto to be associated with. Naruto then spends his time trying to find out the truth behind her leaving. Along the way, he meets new characters who either help or hinder his search.
One possible plot could be that Kushina's departure makes Naruto more determined to prove himself. He might strive harder in his ninja training, using the pain of his mother leaving as motivation. This could lead to him achieving new levels of power at a faster rate.
One possibility could be that Naruto discovers a long - hidden secret about his family that makes him feel betrayed. For example, he might find out that Minato and Kushina had made a deal with a dangerous enemy in the past that put the village at risk. This would be so against Naruto's values of protecting the village and his friends that he decides to leave them.
One possible reason could be a mission. In many Naruto - related stories, missions often take characters away from their families. Naruto might have received a highly important and dangerous mission that requires him to be away from Kushina for a long time.
One possible reason could be to protect Naruto from the hidden threats in Konoha. Maybe she discovers some dark secrets or plots within the village that she believes will endanger Naruto, so she decides to take him away.
If Kushina leaves Minato for Naruto in fanfiction, it would completely change the Naruto universe's family dynamics. Naruto might grow up with a different kind of support system. Instead of the absent father figure of Minato, he could have a more present mother figure in Kushina. This could also change his relationship with the village. Since Kushina was an Uzumaki, her presence could lead to Naruto having an earlier understanding of his heritage.
One possible plot could be that they have to face challenges together in a post - war Konoha. They might work on rebuilding the village while also dealing with their new family life. Naruto, with his experience and Kushina's strong will, could make a great team in leading the village in a new direction.
In this fanfiction, the plot might involve Kushina coming back to help Naruto in his toughest battles. Maybe she uses her unique chakra abilities that Naruto has inherited to give him an edge. She could also provide emotional support, as Naruto has always longed for his mother.
One possible plot could be that Naruto somehow inherits the Rinnegan from an unexpected source and Kushina, being his mother, helps him understand and control this new power. Maybe they discover a hidden connection between the Uzumaki clan and the Rinnegan's origin, leading them on a journey to uncover secrets long lost in the ninja world.
One possible plot could be that Naruto, with his powerful jutsu and leadership skills, takes charge in a situation where Kushina's safety is at stake. He might use his Rasengan to fend off enemies and dominate the battlefield, protecting his mother Kushina in the process.
Perhaps there's a time - travel element involved. Naruto from the future, who has been through some horrible experiences, travels back in time and, in a state of confusion or rage, attacks Kushina. Or it could be that a powerful villain has the ability to manipulate Naruto's emotions and uses that power to make him turn on his mother. This would create a very complex and dark plotline that challenges the normal Naruto narrative.
One possible plot could be that Naruto punishes Kushina for some misdeed she did in the alternate fanfiction universe. Maybe she made a decision that put the village in danger, and Naruto, as a hero, has to take action to set things right.