One possible plotline could be Hermione trying to find a way to bring Crookshanks back. She might search through ancient magic books in the Hogwarts library, desperate for a solution. Another could be her reflecting on all the memories she had with Crookshanks, like when it helped her and Harry figure out things. She could also become withdrawn from her friends for a while as she mourns, and they would have to find a way to reach out to her.
One possible fanfic could be 'The Loss of Crookshanks' on Fanfiction.net. It really delves into Hermione's grief when Crookshanks passes away. The author does a great job of showing her emotional turmoil.
One possible plotline could be that Harry sacrifices himself to defeat a new and powerful dark wizard. In this scenario, his friends are left to pick up the pieces and continue the fight against the remaining dark forces. Another plotline might involve Harry being poisoned by a mysterious and undetectable substance, leading to his slow and tragic death while his friends search desperately for a cure.
Ron could be a bit clumsy in his reaction at first. He might not know exactly what to say, but he would still stay by Hermione's side. He might try to make her feel better by sharing some of his own memories of Crookshanks, like when it chased Scabbers around the common room.
It can make Hermione more vulnerable. Her grief could lead to her making mistakes or being distracted. For example, she might not be as focused in her studies or in helping Harry with his quests.
One possible fanfic could be titled 'The Grief of Harry: When Sirius Fell'. In this fanfic, it might show Harry's immediate reaction of shock and disbelief. He might stand frozen as he witnesses Sirius's death, then slowly sink to his knees, tears streaming down his face as he screams in anguish. His world would shatter, and he'd feel a loneliness like never before.
One possible plotline could be that it explores the emotional aftermath for Sakura. Maybe she has to deal with feelings of loneliness and guilt, even if she wasn't directly responsible for their deaths. It could also show how she rebuilds her life without her family's support.
One possible plotline could be that Harry Potter sacrifices himself to defeat an even more powerful dark wizard than Voldemort. Maybe this new enemy has a power that can only be countered by Harry's self - sacrifice, which would lead to a very bittersweet ending for the wizarding world.
One possible plotline could be that Jimin is facing extreme pressure from the idol life. He might be crying because of the intense schedules, the high expectations from fans and the media. For example, he has to constantly practice, perform and do promotional activities without much rest. In the fanfic, he could reach a breaking point during a particularly tiring tour and break down in his dressing room.
Perhaps Shikamaru has made a decision that deeply affects Naruto. For example, Shikamaru might choose to leave the village for a dangerous solo mission. Naruto, who values their friendship, cries because he's worried about Shikamaru's safety and the thought of losing his friend. In the fanfic, this could lead to Naruto trying to convince Shikamaru to change his mind.
A plotline could be that Hermione is kidnapped by a group of anti - Muggleborn fanatics. They want to make an example out of her to send a message to the wizarding world. Hermione then has to use her wits and the spells she knows to outsmart them. She might start by trying to find out their motives and weaknesses while pretending to be compliant. Along the way, she could also try to convert some of them to see the wrong in their ways. Another possibility is that a time - traveling villain kidnaps Hermione to stop her from achieving great things in the future, and she has to figure out how to get back to her own time and prevent the villain from changing history.