Kakashi would be very observant. He would look for how the fanfiction writers understand the world of Naruto, the values and the moral lessons. He might even use some of the creative ideas from the fanfiction in his own teachings if he thought they were valuable and in line with the spirit of the original story.
Sakura might be the first to notice. She would approach Naruto gently and try to get him to talk about what's wrong. She'd offer him some home - made cake and sit with him, sharing stories of their past adventures to cheer him up.
Naruto would probably be quite affected. He is someone who has been through a lot of hardships in his own life, so a sad fanfiction about himself might bring back some of those difficult feelings. He could be sad for a while, but then he would likely try to shake it off and remember that it's just a story.
Well, there are also those characters who might be a bit shocked or confused. Take Levi from Attack on Titan. He's a very serious and no - nonsense type of character. If he were to read some of the fanfic about him that deviated too much from his own self - perception, like being made into a comical or overly emotional character in the fanfic, he might be taken aback at first. But then he might also realize it's just a different interpretation and not take it too seriously.
Sasuke would likely act like he doesn't care much. But secretly, he might be a bit intrigued as to why Naruto is into such things. He might think it's a waste of time or he could see it as another way Naruto is different from him.
A great sad anime story often has strong character development. For example, in 'A Silent Voice', Shoya's journey from a bully to someone seeking redemption is really moving. His relationship with Shoko, a deaf girl he once bullied, is full of complex emotions. When you see how they both grow and the pain they go through, it makes the story very sad and also very powerful.
Another great one is 'Clannad: After Story'. It shows the life of Tomoya Okazaki after high school. He has to face many difficulties in life, including the loss of his wife Nagisa during childbirth. The story is extremely sad as it portrays the harshness of life and the importance of family. It really tugs at your heartstrings.
Anohana: The Flower We Saw That Day' is also a sad anime. Menma has died, but her spirit lingers. Her friends are haunted by her death and their past actions. They gradually come to terms with their feelings of guilt and grief as they try to help Menma move on.
There were many animes that had been adapted from sad novels, such as Sword God's Domain, About My Reincarnation as a Slime, Index of Forbidden Magic Books, Gate to the Stone of Destiny, and so on. These anime works were all adapted from sad novels. By adapting the anime, the plot and characters in the novel were presented more vividly and attractive. These anime works not only had a breakthrough in the storyline, but also made a lot of efforts in character creation and emotional expression, which was deeply loved by the audience.
Another is 'Clannad'. Tomoya Okazaki meets Nagisa Furukawa, and as their relationship develops, we see the story of her family, including her relationship with her parents and her sister. There are many sad elements, especially when dealing with family hardships and the challenges of sibling relationships in the face of illness and difficult family dynamics.