What are the possible emotional impacts in the fanfiction where Naruto dies saving Haku?

The main emotional impact would be grief. His friends in the seven would be deeply saddened. There would also be guilt for some who might think they could have done more to save him.

One possible plot could be that Fem Haku has some sort of unique ability or knowledge that is crucial for the safety of the Hidden Leaf Village. Naruto and Fem Haku are being pursued by an evil organization that wants to stop her from reaching the village. Along the way, they face numerous obstacles and battles. In a final showdown, Naruto realizes that the only way to ensure Fem Haku's survival and the safety of the village is to sacrifice himself. He gives his life to protect her, and Fem Haku then has to deal with the consequences of his death, like facing the villagers who may blame her, and also has to figure out how to use her abilities to protect the village on her own.

Yes, there might be. Fanfiction websites like FanFiction.net or Archive of Our Own could potentially have such stories. However, it's not a very common or mainstream plot within the Naruto fanfiction realm. You'd have to search through these platforms using relevant keywords to find one.

One possible plotline could be that Naruto arrives just in time to stop Haku from sacrificing himself for Zabuza. He uses his shadow clone jutsu to create a distraction and then manages to pull Haku out of harm's way. Naruto then tries to convince Haku that there is more to life than being a tool for Zabuza.

One way could be that Naruto jumps in front of a powerful attack meant for Haku. Maybe in a battle where Haku is protecting someone Naruto cares about, and Naruto's selfless nature makes him sacrifice himself. Then the story could focus on how the other characters react to Naruto's death, like Sasuke feeling guilty for not being there or Sakura being heartbroken.

One emotional moment could be when Naruto makes the final decision to sacrifice himself for Sasuke. His friends are left in shock and disbelief. The moment of his death is often filled with his thoughts of all the good times and his unwavering belief in Sasuke's redemption.

There would be a lot of anger. Naruto might be angry at his parents for leaving him, and this anger could fuel his determination in some ways. For example, he could strive to become a great ninja just to prove that he didn't need them. But it could also cause problems in his relationships, as he might lash out when reminded of his abandonment.

This event could make Naruto more cautious. After coming so close to death, he might start to think twice before rushing into dangerous situations. He could also become more empathetic towards those in need, having been in Haku's position of being saved. His view of life and death might also change, making him value his own life more while still being willing to sacrifice for others.

One possible plot could be that Naruto and Kakashi are in a fierce battle against a powerful enemy. Kakashi is about to be fatally attacked when Naruto jumps in front of him and takes the hit. As Naruto is dying, he might have some final words for Kakashi, perhaps about the importance of protecting the village and their friendship.

For Harry, it would be a huge loss. He's lost so many people in his life already, and Hermione was like a sister to him. He'd likely feel a deep sense of guilt for not being able to save her. Ron would be devastated too. He might blame himself for not noticing Hermione's illness sooner. Their friendship would be deeply affected, with both of them having to deal with a void that can't be filled.