Naruto might develop a deeper understanding of the power of friendship and how it can cross enemy lines. His act of saving Haku could make him more determined to see the good in everyone. For Haku, he could start to question his loyalty to Zabuza and consider a different way of life, which is a significant character development.
Well, Naruto's character could grow in terms of his leadership skills. After saving Haku, he might take it upon himself to guide Haku towards a more positive path. Haku, on the other hand, may become more open - minded. He could start to learn about the values of the Leaf Village from Naruto and see that there are other ways to live, rather than just following orders blindly. This would lead to a more complex and interesting relationship between them.
Naruto's saving of Haku could also lead to his growth in terms of empathy. He would be able to relate more to Haku's situation of being used by someone. For Haku, it could be a turning point where he realizes his own self - worth. He might start to train with Naruto to become stronger in a more positive way, and this could lead to a new side of Haku being explored in the fanfiction, like his potential as a healer or a diplomat rather than just an assassin.
For Naruto, he would become more aware of different realms and powers beyond his shinobi world. His experience with Hades could make him more mature in handling situations that seem impossible at first. He might also develop a new sense of respect for the afterlife and its rules. As for Hades, he could start to see the value in the living world more, especially through Naruto's eyes. Maybe he becomes less cold and more empathetic towards the living, which is a big change for a god of the underworld.
For Naruto, it could further enhance his reputation as a hero. He might gain more respect from the Hidden Sand Village where Pakura is from. His self - confidence in his ability to save anyone in need would also grow. For Pakura, if she was in a state of despair before being saved, she could regain her hope and determination. She might start to believe in the power of friendship across villages like Naruto does.
The relationship between Naruto and Kaguya would also develop in unique ways. At first, Kaguya might be distrustful of Naruto, but as he continues to save her and show her kindness, she could start to respect and even care for him. This relationship dynamic could add depth to both characters and the overall fanfiction story.
One possible scenario in this fanfiction could be that Naruto discovers Haku and Kimimaro in a dire situation. Haku, with his ice techniques, and Kimimaro, with his powerful bone abilities, are perhaps being overpowered. Naruto, being the hero he is, jumps into the fray. He may convince them to change their ways and join him in Konoha, as he once did with Sasuke. This would not only show Naruto's growth as a ninja but also his ability to bring out the best in others.
His confidence could grow significantly. By being able to save two powerful ninjas, Naruto would prove to himself that he is capable of great things. He may start to believe more in his own abilities and take on more challenging tasks without hesitation. For example, he might be more willing to take on stronger opponents in future battles.
Maybe Naruto uses his Sage Mode to sense their danger and arrives just in time to save them. He then offers them a chance at a new life.
One possible plot development could be that after saving Naruto, Madara tries to mentor him. He sees Naruto's potential and wants to shape him into an even greater ninja, sharing his own knowledge and skills that have been honed over years.
Naruto in fanfiction often retains his core characteristics. He is still the determined and head - strong shinobi. His naivete can sometimes lead to comical situations or, on the other hand, make him more relatable. Haku, in fanfiction, is usually depicted as a complex character. His loyalty to Zabuza is a major aspect, but many fanfics explore what could have happened if he had broken free from that loyalty earlier. His skills with water jutsu make him a formidable opponent, and his grace in battle is often emphasized.
One interesting aspect could be the character development of Sakura. In the original series, she might not have had as much interaction with Haku and Zabuza. In the fanfiction, she could show new skills and a more assertive personality while saving them. For example, she might use her medical ninjutsu in creative ways to heal their wounds.
Perhaps Naruto has some sort of premonition about Sasuke's danger. He follows his gut feeling and finds Sasuke trapped by Haku. He then uses his Uzumaki bloodline power, something that might be enhanced in fanfiction, to disrupt Haku's chakra flow and save Sasuke.