Perhaps Naruto's friends are going through their own personal issues. They could be so focused on their own problems, like family troubles or struggles with their ninja training, that they unconsciously start to ignore Naruto. They might not even realize how much they are hurting him by their lack of attention.
One possible reason could be jealousy. Maybe Naruto has been getting more attention from the village elders or teachers because of his potential. His friends, feeling left out or overshadowed, might start to ignore him out of envy.
It could be a misunderstanding. For instance, Naruto might have been wrongly accused of something, and his friends, without fully investigating, start to distance themselves from him. They might believe the rumors and false accusations, leading to them ignoring Naruto.
One reason could be a misunderstanding. Maybe Harry said or did something that his friends misinterpreted. For example, if he was overheard making a comment that seemed critical of them but was actually taken out of context.
One possible reason could be that Naruto is afraid of endangering his friends. He has many powerful enemies, and he might think that by staying away from his friends, they won't be targeted. For example, Orochimaru was always after Sasuke, and Naruto might fear that his closeness to Sasuke could put Sasuke in more danger.
Naruto might initially feel sad and confused. He could try to prove himself to his friends by working hard on his ninja skills. For example, he might train extra hours to show his friends that he is worthy of their attention.
One possible reason could be jealousy. If Naruto becomes too powerful too quickly, his friends might feel overshadowed and abandon him out of envy.
One reason could be to seek greater power. In fanfiction, the world outside Konoha might be seen as having more opportunities for growth. They might want to train with different masters or learn unique jutsu not available in Konoha.
Perhaps he has been through some sort of mental and emotional breakdown. Maybe he has lost too many battles, seen too many friends die, and he feels that he is a burden or that his death would somehow bring peace to his troubled mind. It could also be related to some prophecy or dark secret he has discovered about himself that makes him think death is the best option for everyone.
There could also be friends who are so loyal to Naruto that they would consider following his request if they truly believe it's for the greater good. However, they would be deeply pained by it. Kakashi, for instance, might understand Naruto's selfless nature but would also struggle with the moral and emotional implications of taking his life.
In some fanfictions, Naruto might be hated by his friends due to a misunderstanding. For example, if there's a false rumor spread about him being a traitor. Another reason could be his sudden increase in power that makes his friends jealous. Maybe he accidentally harms one of them during a training session and they hold a grudge.
In fanfiction, when Naruto is ignored by his friends, it can have a profound impact on his character development. At first, he might become withdrawn, doubting his self - worth. However, this could also be a catalyst for him to become more self - reliant. He might focus on his own training and growth, realizing that he can't always rely on others. This new - found independence could lead to him becoming a stronger shinobi in ways he hadn't before. He may also develop a deeper understanding of loneliness, which could make him more empathetic towards others who are also outcasts in the future.
One possible reason could be that he has some unresolved issues from his past, like the absence of his parents during his childhood which made him feel a sense of detachment. Maybe he is so focused on achieving his ninja goals that he unconsciously starts to ignore his family. Another reason might be some sort of miscommunication within the family. For example, if there are secrets that the family has been keeping from him, he might feel betrayed and thus choose to ignore them.