His friends would be devastated. They might go through a period of intense grief, blaming themselves or the circumstances that led to his death. Some might become withdrawn, while others could be driven by revenge. His family, if he has any in this universe, would be in shock. They might hold funerals or memorials in his honor. His enemies, on the other hand, might initially celebrate his death, but later realize that his absence creates a power vacuum that leads to new and unforeseen problems.
Well, if he had a love interest, she would be heartbroken. She might fall into a deep depression, unable to come to terms with his loss. His comrades in arms, if he was part of a fighting group, would feel a great sense of loss and a need for vengeance. They would vow to carry on his mission in his memory. The general public, if he was a well - known figure, would be in mourning. There could be public outpourings of grief, with people leaving flowers and tributes at places associated with him. And the political powers in the alternative universe might use his death to their advantage, either to gain more control or to push their own agendas.
His death might cause emotional turmoil among the other characters. They could start to question their own mortality or the fairness of the universe. It could also lead to a division among the characters, some blaming others for Loki's death.
Perhaps in this alternative universe, human Loki is a political figure. He tries to bring about radical changes to a corrupt system. However, his enemies manage to frame him for a heinous crime. Unable to prove his innocence, he is sentenced to death. His death then sparks a revolution as the people realize they have been deceived. Or he could be an adventurer exploring a dangerous and ancient ruin. He accidentally triggers a deadly trap that kills him, leaving behind a legacy of mystery and tales of his exploits.
Well, Thor might be a bit shocked at first. He'd probably be amused by some of the wilder interpretations of his brother in the fanfiction. Captain America, on the other hand, would likely be confused by the whole concept as it's so different from the traditional stories he's used to. Iron Man would probably make sarcastic comments about how creative the fans are in coming up with these stories.
The more idealistic members of Young Justice like Robin might be immediately suspicious of Loki. He represents chaos and trickery, which goes against Robin's sense of order and justice. He would probably try to keep the team away from Loki until they know his true motives.
Tony Stark would probably be very intrigued. He'd want to study Loki's Jotun form, maybe even make some snarky comments about his blue skin. Steve Rogers, on the other hand, would be more cautious. He'd be ready for any potential threat that Loki might pose.
Thor might be conflicted. He'd see his nephew/niece but also remember Loki's treachery. Iron Man would probably be sarcastic at first, making remarks about the family genes. Captain America would be more cautious and diplomatic, wanting to give her a chance but also being on guard. Black Widow would try to read her body language and motives right away.
Loki's character, with his mischievous nature and magic abilities, would bring a whole new level of intrigue to the Hunger Games. He could use his illusions to manipulate the other tributes and the Gamemakers. Tony, on the other hand, with his intelligence and resources, could find ways to hack into the Hunger Games' systems or create advanced weapons. For example, he might make a shield that can deflect not only physical attacks but also some of the Capitol's technological threats.
Ryuk would probably just be amused. He is a Shinigami who has seen a lot in his existence. Fanfiction is just another strange human creation to him. He might chuckle at some of the more outlandish ideas in the fanfictions, like a character having superpowers beyond the Death Note.
Mr. Schuester would be in shock. He saw Rachel as one of his star pupils and a driving force in the Glee club. He would struggle with the guilt of not being able to protect her. He would try to keep the club going as a way to honor her memory, but it would be very difficult for him. He might also start a scholarship fund in Rachel's name for future Glee club members.
Sakura would probably be both scared and fascinated. She might initially be frightened by the dinosaurs but then use her medical ninja skills to help any injured people. Sasuke would be more aloof. He'd likely see the dinosaurs as just another challenge. He might study their behavior to find weaknesses and use his sharingan if any of the dinosaurs pose a real threat.