For her family and friends, it would be a great loss. They would be mourning not only her death but also the fact that she was so consumed by love that it led to this end. Her family might feel angry at the person she was in love with, thinking that they could have prevented it.
If there are rivals in the love story, the boy's death can have different effects. Some rivals may feel a strange sense of remorse, even if they were competing for the girl's love. Others may see it as an opportunity, but this often comes with a heavy burden of guilt. The death of the boy can also inspire other characters to be more open about their feelings or to cherish the people they love more, as they have witnessed the tragic consequences of unspoken or unfulfilled love.
The other characters might be filled with guilt if they were supposed to be watching her. They could also be in shock and disbelief.
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.
The death of Rarity would deeply sadden Twilight. They are good friends and Twilight would feel like she has lost a part of her support system. She might become more withdrawn as she tries to come to terms with the loss.
Well, in many RWBY fanfictions, Penny's death is a turning point. It affects the other characters in different ways. Some characters might become more vengeful. For Weiss, it could be a moment that makes her re - evaluate her own stance on the war. The story then might shift towards a darker or more somber path as the characters deal with this loss.
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 Without her, Weiss might become more cynical and withdrawn.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.
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.
The other characters would be deeply shaken. For Hermione's friends like Luna, she would be there to comfort Hermione but also be in awe of Draco's selflessness. Neville might be inspired by Draco's act and start to believe that people can change more than he thought. Draco's death would also send ripples through the Slytherin house. Some might be ashamed of how they had treated Draco before, while others might try to carry on his new - found heroism. As for Hermione herself, she would be forever changed. She would become more determined to fight for good in Draco's memory and might even become a bit more withdrawn as she copes with the loss.
For Sasuke, if he had a relationship with a female Naruto, her death would be a huge blow. He might become more reclusive and angry, blaming himself or others for not being able to protect her. He could even go on a quest for vengeance against those he deems responsible.
Jeremy's death in fanfiction can have different impacts. His friends in the Salvatore brothers might become more vengeful. They could go on a rampage to find out who was responsible. Elena might struggle with her vampirism even more, as she has now lost her last remaining family member. Some fanfictions might show that Caroline steps up to be more of a support for Elena, filling the void left by Jeremy's death.