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.
Well, there could be a lot of consequences. For starters, the balance of power in the ninja world could shift. Haku was a skilled ninja, and his return could give an advantage to the side he allies with. Also, there might be some unforeseen spiritual or chakra - related consequences. Maybe the act of reviving Haku disturbs the natural flow of chakra in the world, causing some strange phenomena to occur. Emotionally, Naruto himself might face a great deal of stress. He has to deal with the responsibility of bringing Haku back and the potential backlash from the ninja community. And Haku may struggle with feelings of being an anomaly, as he was once dead and now is alive again.
Well, in some fanfiction ideas, Naruto might use some powerful jutsu. For example, he could discover a new form of the shadow clone jutsu that allows him to transfer life force. He clones himself multiple times and combines their life energy to bring Haku back. Another way could be through some kind of ancient forbidden jutsu he stumbles upon. Maybe it's a jutsu that requires a great sacrifice on his part, like giving up some of his own chakra permanently.
One consequence could be a change in the family dynamic. His mom would be back, and Naruto would finally have the family he always dreamed of. This might also have an impact on his relationship with his dad, as they would all be together again.
The ninja world would be in shock. Mito Uzumaki was a very important figure in the past. Her revival could bring a lot of ancient knowledge back. For example, she might know some secrets about sealing jutsu that have been lost over time. This could change the balance of power among the villages.
Hashirama's revival might also bring back old wisdom and knowledge. He could teach the new generation of shinobi things that have been lost over time. However, there could also be political issues. Some might not be happy with a long - dead Hokage coming back and potentially interfering in current affairs. And his revival could also have an impact on Naruto's own growth. With Hashirama around, Naruto might have to re - evaluate his role as a leader and a shinobi.
One consequence could be an imbalance in the world's population. There might be too many people for the existing resources, leading to shortages of food, water, and living space.
On a personal level, Naruto would finally get the family he always wanted. But it might also bring some confusion and adjustment issues. His parents would be from a different time, and they'd need to adapt to the new world Naruto lives in. For example, they might be shocked by the new technology and the changes in ninja warfare.
In a fanfiction where Naruto revives Kaguya, it could lead to chaos. Kaguya was extremely powerful and her revival might put the ninja world in danger again. Naruto might have his reasons, like seeking more knowledge about the origin of chakra, but he would also have to face the consequences of bringing back such a powerful and potentially malevolent force.
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.
Naruto would probably give Haku training on chakra control. Since Naruto has had to work hard on his own chakra control, he'd be able to pass on some useful tips. For example, he could teach Haku how to better focus his chakra for more precise attacks.
The power balance in the ninja world would be severely disrupted. Hashirama was known for his Wood - Style jutsu and his ability to control tailed beasts, and Madara was extremely powerful in his own right. Their return could create new power struggles among the villages.