One possible reason could be that the author has run out of ideas for Naruto's character development. Maybe they've explored all the typical arcs and growth opportunities for him in their story, and don't know how to take it further. Another reason might be that they want to shift the focus to other characters in the fanfic. Sometimes, a fanfic starts with one main character like Naruto, but as the story progresses, other characters become more interesting to develop.
Perhaps the author has lost interest in Naruto as a character. Writing a fanfic requires a certain level of passion for the character you are writing about. If the author has discovered other characters or aspects of the Naruto universe that they find more exciting, they may find it hard to continue writing about Naruto. Also, real - life distractions or a lack of time can contribute to not being able to carry on with a Naruto - centered fanfic.
Maybe he's been cursed by a powerful enemy. In many fanfics, an enemy might use a dark jutsu to take away Naruto's ability to feel. It could be a way to weaken him both physically and mentally.
One reason could be to save him. Maybe Harry is injured during a battle or some sort of magical accident, and Snape, despite their differences, steps in to carry him to safety. For example, if Harry is hit by a dark curse and Snape, with his knowledge of dark magic, knows he needs to get Harry to the infirmary quickly.
One reason could be curiosity. Naruto might be curious to see how fans imagine different scenarios in the Naruto Shippuden universe. Maybe he wants to see how others view his friends and his own adventures.
Yes, there might be such fanfics. One possible reason could be exploring alternative storylines. Writers might want to break the traditional view of Naruto's loyalty to Konoha to create more complex and unique plot twists. For example, they could be imagining a scenario where Naruto discovers some dark secrets about Konoha that make him question his loyalty.
Another possibility is jealousy. Maybe in the fanfic, Sakura shows more interest in another character, like Sasuke perhaps, and Naruto, who has his own feelings for Sakura, snaps out of envy. It's a common trope in fan - made stories to play with the characters' emotions like this.
In the fanfic, Naruto could hate the Hokage because of some bad experiences related to past Hokages. Perhaps he discovers some dark secrets about how the Hokage office has made decisions that he doesn't agree with. It might be something like a cover - up of certain events that Naruto believes should have been dealt with more fairly.
One reason could be that she realizes she has been too dismissive of Naruto's feelings for her. She might have led him on or been cruel in rejecting his advances in the past. Another reason is that she finally understands how much Naruto has sacrificed for the village and for her personally, and she feels guilty for not showing him more respect and gratitude earlier.
Another possibility is that he wants to explore the world outside Konoha on his own terms. Naruto has always been curious, and in a fanfic, he might decide that he can't be tied down to one place. He could be on a quest for self - discovery, believing that Konoha's environment is limiting his growth.
In such a fanfic, it might be due to a false accusation. Suppose Naruto is wrongly accused of a heinous crime like mass murder in the village. Everyone turns against him, and he has no way to prove his innocence. This overwhelming sense of injustice and isolation could drive him to suicidal thoughts. Also, if he discovers some dark secrets about his past, such as his parents' real cause of death being related to some sort of betrayal he unknowingly caused, it could break his spirit.
One possible reason could be Naruto's pent - up anger towards Minato for leaving him as an orphan. He might feel that Minato sacrificed himself without fully considering the consequences for Naruto.