Even his enemies could be affected in some ways. They might be surprised by his selfless act and some of them could have a change of heart. There could be a group of former enemies who start to question their own motives and actions after Percy's death, leading to a potential shift in the power dynamics and alliances in the fanfiction world.
Family members, if he has any in the fanfiction world, would be devastated. His mother, for instance, would have to deal with the loss of her son. She might become more involved in the affairs of the demigod world, trying to make sure that her son's sacrifice was not in vain. Also, his half - siblings, if any, would be affected. They could be inspired to step up and prove themselves worthy of Percy's sacrifice.
Peter Parker would be extremely affected too. Iron Man was like a mentor to him. His death could make Peter question his own abilities and whether he can continue to be a hero without Iron Man's guidance. He might also feel a sense of guilt, thinking that if he had been stronger or more experienced, he could have saved Iron Man.
The other students at Hogwarts would also be affected. For example, Neville, who looks up to Harry. If Harry ignores everyone, Neville might feel lost. Ginny, who has a special connection with Harry, would be deeply hurt. And the teachers like Snape, who has a complex relationship with Harry, would also be impacted. Snape might be secretly glad at first, but then realize that Harry's isolation could be a sign of a bigger problem in the wizarding world.
Obviously, Harry's closest friends like Hermione and Ron. They would be devastated. Hermione would probably be racked with guilt for not being able to prevent it. Ron would be angry and at the same time lost without his best friend.
Percy's family members could be in the fanfiction too. His mom, for example, would be worried sick if Percy started ignoring everyone. She'd be trying to figure out if something happened at school or with his friends. His dad, Poseidon, might also play a role, perhaps sensing Percy's distress from afar and trying to intervene in some way.
Obviously, Bella is a key character even though she dies. Her presence is felt throughout the story, especially through the memories of other characters. Edward is also a main character. His relationship with Bella was central, and after her death, his actions and emotions drive much of the plot. The baby is another important character. Its very existence is what led to Bella's death, and its future is a big part of the story.
Well, Percy is obviously one of the main characters since the title mentions him. Other likely characters could be the Olympian gods and goddesses. For example, Zeus, Poseidon, and Athena are important figures in Greek mythology and would probably play significant roles in a story set in the Olympian world.
Bella, obviously. She is the one who is pregnant and will have to face all the physical and emotional changes that come with it. Her life will be completely turned around as she prepares to be a mother.
Twilight Sparkle would likely be affected as she is often at the center of things in the MLP universe. Her actions and decisions would be crucial in any alternate ending, whether she's saving the day or facing new challenges.
In addition to Sasuke, Kakashi, and Sakura, other characters like Iruka sensei would be affected. Iruka was one of the first people to believe in Naruto. Naruto's death would be a huge blow to him. Also, the villagers of Konoha who had started to see Naruto in a new light might have to re - evaluate their views. And characters in the Land of Waves, like Tazuna and his family, who had come to rely on Naruto's help, would also be impacted. They might lose hope or face greater danger without Naruto there to protect them.
Hinata would also be highly affected. She has always admired Naruto from afar. By seeing his memories, she would understand him on a whole new level, his struggles, his hopes, and it would likely strengthen her feelings for him even more. And it could also change how she interacts with him in the story.