Well, in some fanfictions, Minato might use his powerful jutsu to break through the barriers between the living and the dead and directly reach Naruto. He could also try to influence the people around Naruto to bring him closer to where Minato is, like using his spirit to communicate with Naruto's friends and convince them to help.
It could be about Naruto coming back to the Hidden Leaf Village after a long and mysterious journey. Maybe he has new powers or knowledge that he uses to protect the village from a new threat.
In fanfiction, the possibilities are endless. Naruto could potentially bring back the dead if the writer wants to explore themes of second chances, redemption, or the consequences of messing with the natural order. For instance, if Naruto brings back Sasuke from the dead, it could lead to a whole new arc where Sasuke has to come to terms with being brought back and how it affects his relationships with others. It could also create conflict within the ninja community as some might see it as a dangerous precedent.
One consequence could be that it messes with the natural balance of the ninja world. Maybe the cycle of life and death is disrupted, and this causes some strange phenomena to occur, like abnormal weather or chakra imbalances.
She might start by using her knowledge of Naruto's past. Since she is his mother, she knows things about his early life that no one else does. She could use these memories to create an emotional connection with him. Maybe she'll show up in his dreams first, like a hazy memory, and then gradually reveal herself in the real world.
One reason could be that Minato has some unfinished business with Naruto. Maybe he wants to pass on some crucial ninja skills or knowledge that only he can teach. Another reason might be the strong father - son bond. Despite being separated for so long, Minato's love for Naruto is still very deep.
In certain fanfic ideas, Naruto could have made a deal with some sort of otherworldly being. He might have sacrificed something of great value, like a part of his own chakra or a future ability, in exchange for Kushina's life. Another possibility is that he finds a way to reverse the very nature of death by using some unique properties of the tailed beasts' chakra that he has access to.
Naruto's reaction could be complex. On one hand, he would be extremely excited. But on the other hand, he would be worried about the consequences. He has learned about the balance of the ninja world and might be afraid that bringing Kushina back could have negative impacts. However, his love for his mother would probably overpower those concerns in the end, and he would still strive to make her return a reality.
In many 'Naruto Demon Back Fanfiction', Kakashi can be a popular character. He has a lot of knowledge and experience, so he could be the one to guide Naruto about his demon back. Additionally, characters like Jiraiya might be present as well. Jiraiya could have some secret knowledge about the demon back that he imparts to Naruto, which helps Naruto on his journey.
One common theme is redemption. Naruto often goes back in time to right the wrongs of the past, whether it's saving a fallen comrade or preventing a great disaster. Another theme is self - improvement. He uses the knowledge from his future self to become a better shinobi faster.