For the Uzumaki clan, it could mean a revival of sorts. Kushina was an important Uzumaki. Her return might bring back lost knowledge and techniques of the clan. Also, it could strengthen the clan's standing in the village as she was also the wife of the Fourth Hokage. Politically, this could change how the village views the Uzumaki clan.
The relationship dynamics in the village would also change. Kushina was a strong - willed and powerful ninja. Her presence could influence the way the village is run. She might also have some ideas on how to better train the new generation of ninjas, especially those from the Uzumaki clan. And she could be a source of emotional support for many characters who lost their loved ones, as she has been through a lot herself.
One big impact would be on Naruto himself. Having his mother back would give him the family love he always longed for. He would have someone to share his problems and joys with on a more personal level.
It could change the power balance in the ninja world. Other villages might see Konoha as a much greater threat with Minato and Kushina back. On the other hand, it could also lead to more cooperation as they might be seen as a symbol of hope. Emotionally, for Naruto, he would be able to learn more about his family, his heritage, and maybe even get some long - awaited parental guidance which would further develop his character.
On a personal level, for Naruto, it would mean having his parents around. He could finally experience a real family life. Kushina could teach him more about the Uzumaki clan's techniques and traditions. Minato could train Naruto further in his unique jutsu. Emotionally, it would be a great comfort for Naruto and many of his friends who knew about his longing for his parents.
In a time travel fanfiction where Naruto marries Kushina, the impact on the Naruto world would be multi - faceted. Genetically, it's a very strange situation. But if we look past that, politically, their union could bring about peace faster. Since Naruto has the ideals of the future and Kushina has the influence of her clan in the past. Socially, it would shock many. People would have to adjust to this new relationship. And in terms of the ninja arts, Naruto could teach Kushina some future techniques, and she could pass on her unique skills to him, changing the way battles are fought in that time period.
In certain fanfic concepts, Naruto could have found a special relic or artifact. This relic might have the power to reverse death. Since Naruto is always on adventures and exploring different places, he might stumble upon such an item and use it to revive Kushina. It could also be related to the Uzumaki clan's secrets that he uncovers which enables him to bring his mother back.
Perhaps Naruto finds a way to travel back in time and prevent Kushina's death in the first place. He could use his Sage Mode or some other special ability to manipulate time. And then, by changing the past, he effectively'revives' her in the present. In the Naruto universe, there are all kinds of crazy powers, so time - travel isn't completely out of the question.
The relationship between Konoha and the Uzumaki clan might be further strained. With Kushina leaving, Konoha would lose an important link to the Uzumaki. And other Uzumaki members might see this as a sign that Konoha is not a safe place for them.
Naruto would gain more confidence. With Kushina by his side, teaching him and giving him support, he would feel more secure in his abilities. He would know that he has his mother, a strong ninja in her own right, guiding him.
One consequence could be that Naruto is seen as a hero by some, but also as a rule - breaker by others. The ninja world has rules about bringing back the dead, and Naruto's actions might stir up controversy. Some might fear that this new ability of his could be misused. Haku, on the other hand, would have to adjust to a world that has changed since his death. He might face challenges in reconnecting with his old friends or finding his place in the new ninja world.
If the fight got really intense and out of hand, it could also make Naruto feel pressured to choose sides. However, Naruto being Naruto, he would most likely try to find a way to reconcile them instead. This would show his growth as a person and his ability to rise above family disputes.
If Naruto found Kushina alive in a fanfiction, it might lessen his focus on Sasuke for a while. He'd be more centered on getting to know his mother. But in the long run, it could also make him stronger and more determined in his rivalry with Sasuke. With Kushina's support, Naruto would have a new source of motivation to prove himself not just to Sasuke, but also to his mother.