In a 'Naruto dies for Kakashi' fanfiction, the plotline might be centered around a prophecy. There could be a prophecy that says only through Naruto's sacrifice can Kakashi survive a great catastrophe. As the catastrophe approaches, Naruto accepts his fate and sacrifices himself for Kakashi. Or maybe Kakashi has a secret mission that he is on the verge of failing, and Naruto steps in to take over, but the mission is so dangerous that it results in his death. There could also be a situation where Kakashi is being framed for a crime he didn't commit, and Naruto tries to prove his innocence but ends up losing his life in the process.
A possible plotline could start with Kakashi being captured by an enemy who wants to extract some important information from him. Naruto, along with his friends, goes on a rescue mission. However, during the rescue, they are trapped. Naruto, realizing that Kakashi is in immediate danger of being killed, uses his body to shield Kakashi from a deadly attack. This act of self - sacrifice leads to his death. Another plotline could be set in a future where Kakashi is on the verge of death due to an incurable disease, and Naruto, in an attempt to save him, gives up his life force.
One possible plotline could be that Kakashi is in a life - threatening situation during a battle against a powerful enemy. Naruto, seeing no other way to save him, uses a powerful and self - sacrificing jutsu that costs him his life. Another plotline might involve Naruto making a deal with some dark force to save Kakashi, but the price is his own life. Or perhaps in a mission gone wrong, Naruto takes a fatal blow meant for Kakashi.
One possible plotline could be that Kakashi sacrifices himself in a battle against a powerful new enemy. Maybe he uses his Sharingan to its fullest extent to protect the village, but the strain is too much and he succumbs to his injuries. Another could be that he is poisoned during a mission and despite the efforts of the medical ninja, he passes away, leaving Naruto and the others devastated. This would lead to Naruto being even more determined to achieve peace in Kakashi's memory.
Well, if there is a 'naruto kills kakashi fanfiction', it would be a very different take on the Naruto universe. It could be set in a world where Naruto has been corrupted by an evil force. This force could be manipulating Naruto's emotions and memories, making him think Kakashi is a threat. In the original series, they have a strong bond, so this would be a very controversial and unexpected plot.
One possible plotline could be that Hanare is in some kind of danger and Naruto and Kakashi team up to protect her. Maybe she has some special knowledge or ability that an enemy wants to get their hands on. Naruto's determination and Kakashi's experience would make for an interesting dynamic as they fight off the bad guys.
A possible plotline could be that a new enemy targets Kakashi because of his distinct face features, believing there is some hidden power in his appearance. Naruto then has to protect Kakashi. Another plotline could be a magical spell that gets cast on Kakashi's face, changing his expressions uncontrollably, and Naruto tries to find a way to break the spell.
One possible plotline could be that Naruto starts to mimic Kakashi's fighting style more closely. Since he looks like Kakashi, people around him might initially mistake him for Kakashi in battle. This could lead to some comical situations, like when his friends are confused about whether it's really Naruto or if Kakashi has some sort of new jutsu that makes him look like Naruto. Another aspect could be that Naruto, in looking like Kakashi, might start to inherit some of the mystery and respect that Kakashi has. Villains might be more cautious around him, thinking he has Kakashi's strategic mind as well.
One possible plotline could be Naruto going back in time and meeting young Kakashi during his ANBU days. Naruto might be shocked to see the cold and distant Kakashi at that time. He could try to break through Kakashi's walls and get to know the real him. Maybe Naruto would share some of his own experiences and wisdom from the future, which could have an impact on Kakashi's development.
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.
One possible plotline could be them dealing with the challenges of Kakashi's ninja duties while maintaining a marriage. Another could be Rin adjusting to life in Kakashi's village.
One possible plotline could be them dealing with the unexpected pregnancy in the middle of their ninja duties. They might have to balance their responsibilities to the village with preparing for a new life. Another could be the reactions of their friends and comrades in the village. For example, how Naruto or Tsunade would react to the news.
Maybe in the fanfiction, Naruto dies due to an incurable disease. Hinata is heartbroken. She starts to isolate herself at first. But then, remembering Naruto's unwavering spirit, she decides to get involved in the village's affairs more actively, especially in areas that Naruto was passionate about, like helping the orphans. And she might also try to find a way to bring back Naruto, perhaps through some ancient jutsu that she discovers.