It could make Naruto more introspective. He might question his own worthiness of Hinata's sacrifice. This could lead to him delving deeper into his own beliefs and values. He may also become more empathetic towards others who have lost loved ones, as he now has first - hand experience of that kind of pain. He would grow in maturity, realizing that his actions have consequences not just for himself but for those around him who care about him deeply.
Naruto's character could become more solemn. The loss of Hinata would take away some of his carefree nature. He would be constantly reminded of her sacrifice and would strive to honor it. His relationships with others would also change. He might be more guarded in some ways, but at the same time, he would be more committed to his friends and allies, not wanting to let anyone else down after what happened to Hinata.
Naruto might become more determined. With Sakura's death, he could see the harsh reality of the ninja world more clearly. It might make him more resolved to bring peace, as he has now lost someone important. He may also become more protective of his remaining friends, vowing not to let any more harm come to them.
Well, Naruto's death would likely shatter Sasuke. He has always had Naruto as a sort of anchor, whether he admitted it or not. His whole life has been intertwined with Naruto's. Naruto's death might make Sasuke question his entire purpose. He could initially be filled with rage and a thirst for revenge, thinking that he could have prevented it. This could lead him down a darker path at first. But eventually, it might also make him realize the importance of Naruto's ideals and he could strive to carry them on in Naruto's memory.
Well, if Sasuke dies in this fanfiction set in the Wave arc, Naruto would likely become more determined to avenge him. He might also grow more solemn and focused on his ninja training, realizing the fragility of life. His view of the world could shift from being a bit more carefree to a darker, more serious one as he grapples with the loss of his friend and rival.
Naruto's character development in fanfiction can be quite diverse. He could be shown further maturing as Hokage, learning new leadership skills. Hinata, with her shy nature, might be depicted as becoming more assertive in fanfiction, especially when it comes to protecting her family and the village. Sakura, known for her strength, could be shown evolving her medical ninjutsu to new heights. In many fanfictions, we see these characters grow in ways that complement each other, like Naruto's optimism inspiring Hinata and Sakura to be more confident in their abilities.
In such a fanfiction, one possible plot development could be that Naruto sacrifices himself during a major battle against an extremely powerful enemy. Maybe an enemy that has the power to destroy the entire Hidden Leaf Village. Naruto, being the hero he is, steps in to protect Hinata and in the process, takes a fatal blow meant for her. This would lead to great sorrow among the villagers, especially Hinata who would be heartbroken. She might then vow to carry on Naruto's will and protect the village in his memory.
In such fanfiction, Hinata's actions could potentially stunt Naruto's growth. If she hurts him, Naruto, who is often portrayed as sensitive beneath his bravado, might become more guarded. It could lead to him doubting his own self - worth, especially if the hurt comes from someone he cares about or trusts.
He would be filled with rage. Naruto has a strong sense of justice and the fact that someone took Hinata away from him would fuel his anger. He would vow to find and punish whoever was responsible. He might even become reckless in his pursuit of vengeance, endangering himself and those around him. His friends would have to step in to try and bring him back to his senses.
Her increasing strength also plays a role. In some fanfictions, Hinata trains hard and becomes a powerful ninja. When she uses her skills to protect Naruto or help him in battles, it pleases him. Naruto has always respected strength, and seeing Hinata grow in power makes him proud and happy, and also makes him see her in a new light.
Hinata would likely become more independent. For example, if she was often relying on Naruto for emotional support, she'd have to find that within herself. She might become more assertive in the village, using her skills to protect it as Naruto did.
He would be filled with a deep sense of grief. Naruto has always cared about Hinata, and her death would be like a part of him has been ripped away. He might isolate himself for a while, blaming himself for not being able to protect her. But eventually, he would use his pain as motivation to get stronger and fight against whatever caused her death.