No. Most Naruto fanfics tend to focus on positive relationships, growth of characters, and adventures within the Naruto universe. A plot where Sakura kills Naruto goes against the general themes of friendship and camaraderie that are central to the Naruto series, so it's not very common.
Well, in a 'sakura kills naruto fanfic', it could be that the writer wants to explore a completely different side of Sakura's character. Perhaps in this fanfic's universe, Sakura has been corrupted or misinformed in some way that leads her to believe Naruto is a threat. It could also be a very edgy attempt at creating a shock - value story within the Naruto fan community.
I'm not aware of any legitimate 'naruto kills sakura fanfic' in the mainstream Naruto fan community. This goes against the general nature of the Naruto series where the characters are friends and comrades. Most fanfics focus on positive relationships and adventures among the characters.
Another reason could be a very dark and alternative interpretation of the characters. Maybe the writer has a different view of Naruto's character arc and how he could be pushed to the extreme. And they see Sakura as a character that could be sacrificed in this extreme version of Naruto's story. But this is a very far - fetched view considering the original story's development.
There could be. Fanfiction allows for a wide range of interpretations and alternate storylines. But it's a really extreme and disturbing concept considering the bonds that Naruto, Sakura, and Sasuke share in the official story. It would be a very different take on the characters, and most fans who love the original story would probably find it hard to accept.
Sakura might be in shock at first. Unable to believe that Naruto, who has always been so strong - willed, could have ended his own life. As she processes it, she could become angry, not at Naruto but at herself and the situation that led to this tragic outcome.
I'm not sure if there is such a specific fanfic. The idea of Naruto killing Sasuke and Sakura goes against the general themes of friendship and redemption in the Naruto series. Most fanfics tend to explore positive relationships and character growth rather than such dark and out - of - character scenarios.
Maybe in a very dark and twisted fanfic, Naruto could be possessed by some evil force. This would override his normal sense of self and his love for his friends, causing him to harm them.
In such a fanfiction, one possible storyline could be that Sakura is under some dark magic or mind control which makes her turn against Naruto. Another could be a huge misunderstanding where she believes Naruto has done something unforgivable to her or their friends.
Naruto could try to talk her out of it. He is a firm believer in the power of friendship and words. So, he would likely use his words to try and break whatever spell or wrong idea is in Sakura's head that made her want to kill him.