One possible plotline could be that Tomoya sacrifices himself to save Nagisa from a terminal illness. In the original story, he's very dedicated to her, so in a fanfic, he might give his life force or something similar to ensure her survival. This would leave a huge impact on the other characters, especially Ushio, who would grow up without her father.
Nagisa would be completely devastated. She has a very deep connection with Tomoya, and his death would likely cause her to sink into a deep depression. She might even lose the will to live, especially if it happened suddenly. For example, if he died in an accident, she would be left with a sense of emptiness and longing for him.
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 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.
A plotline could be that Ron is killed in a magical accident during an experiment gone wrong. This accident might be related to some new, dangerous magic that he was trying to master. His death would shatter the trio. Harry would feel guilty because he might have been involved in the experiment in some way. Hermione would be grief - stricken and would pour herself into research to try and understand what went wrong. The fanfic could then explore how the wizarding community reacts to Ron's death, with some blaming Harry and Hermione, and others mourning the loss of a great wizard. It could also show how Harry and Hermione have to grow and become stronger individually to face the challenges that come their way after Ron's death.
Tomoya survives in Clannad After Story. The series takes the characters through various challenges and emotional arcs, but he makes it through to the end.
In Clannad After Story, Tomoya is typically depicted as being 19. This age marks a significant period of growth and development for his character.
Their story inspires fans because it's a story of growth. Tomoya starts off as a lost soul, and Nagisa is a bit of a wallflower. But through their relationship, they both become better. Fans can see that love can change people for the better. It gives hope that no matter how broken or lost you are, someone can come into your life and make it better.
Their relationship is special because of their mutual understanding. Nagisa is shy and gentle, while Tomoya is a bit of a delinquent at first. But they see the best in each other. Tomoya encourages Nagisa to pursue her dreams, like restarting the drama club. And Nagisa gives Tomoya a sense of purpose and family. Their love grows slowly and steadily, which makes it really touching.
Perhaps in the fanfic, Bakugo dies due to a tragic accident. For example, he could be involved in a training exercise that goes horribly wrong. His death would then shock the entire U.A. High School. His classmates would struggle to come to terms with it, and it might cause some of them to question the safety measures in place at the school. It could also be a turning point for the story, leading other characters to be more cautious and less reckless in their actions.