In certain fanfictions, the emotional impact is so great that it changes the relationships between characters. For instance, Gary, who was once a rival, becomes more empathetic and devotes himself to carrying on Ash's unfinished business. His death is like a shockwave that alters the emotional landscape of the Pokémon world.
Some fanfictions show that the entire Pokémon community is in mourning. Trainers from all over come to Mount Silver to pay their respects. His death shakes the confidence of young trainers who looked up to him, but also inspires them to be better.
In some fanfictions, when Naruto and Sasuke die, their friends like Sakura and Kakashi are completely devastated. Sakura might lose her will to continue as a ninja for a while, and Kakashi could feel like he failed as a mentor. The whole Hidden Leaf Village goes into a state of mourning.
There could be a fanfiction where Ash's death on Mount Silver is a mysterious event. His friends, like Misty and Brock, set out to uncover the truth behind his death, only to find that it was related to an ancient prophecy.
Often, the emotional aspect is shown through the characters' actions. For example, someone like Robin might throw himself into his work even more to avoid dealing with the pain. Or a character might lash out at others because they are so angry about Artemis's death. The fanfictions also might show the team trying to keep her memory alive, like by creating a memorial or doing things she used to love in her honor.
I'm not sure which specific 'Ash, Amnesia, Mount Silver' fanfic you are referring to. There could be many different interpretations in such a fanfic. Maybe it's about Ash having amnesia in the Mount Silver area. It could involve his adventures there while trying to regain his memories or dealing with new challenges that his amnesia brings.
Many fanfiction writers will use flashbacks to heighten the emotional impact. By showing happy memories of Percy and Annabeth, and then contrasting them with the present where they are gone. They might also have characters find solace in the memories of the two, and slowly come to terms with their deaths through the power of those memories.
Some fanfictions might show a heroic sacrifice. For instance, Ash and Pikachu could be saving the Pokémon world from a great evil and in the process, lose their lives. Others may depict it as a sudden and unexpected event, like an illness or an accident. There could also be fanfictions where their deaths are a result of a long - drawn - out battle against a powerful foe that they ultimately can't win.
One way could be to focus on the positive aspects the character brought to the story. It helps shift the focus from the sadness of their death.
For Weiss, Ruby's death could shatter her sense of hope. Ruby was always the one who seemed to bring light and optimism to the group. Without her, Weiss might become more cynical and withdrawn. She may also question the purpose of their fight.
The Avengers as a whole would be shaken. They would likely experience a range of emotions from anger to sadness. There could be internal conflict within the team as they try to figure out how to move forward without him. Some might blame themselves for not being able to protect him, while others would be more focused on preventing future losses.
In many fanfics, Tony's death shatters the Avengers. Pepper is left heartbroken and often has to find a new purpose in life. Captain America may feel guilty for not being able to protect him better. For Peter Parker, it's like losing a father figure. He might struggle with his identity as Spider - Man and question whether he can continue without Tony's guidance. The team as a whole may become more fragmented as they deal with the loss of their brilliant and resourceful member.