Spider - Man, being the youngest of the group, would be really excited. He would love seeing all the different versions of the Avengers' story. He might even get some inspiration from the fanfiction for his own heroic deeds. He could exclaim 'This is so cool! There are so many ways our story can be told!'
The characters could have mixed feelings. They might appreciate the creativity of the fans in some cases. For instance, if a fanfiction delves deeper into a relationship between two characters in a way that makes sense, they could be happy about it. But if the fanfiction goes against their values or misrepresents them, they would be unhappy. Take the Goblin Slayer, he values his mission above all, if a fanfiction makes it seem like he doesn't, he would be displeased.
Some characters might be amused. For example, Iron Man could be like 'Well, this is an interesting take on our story.' He might find the creative interpretations of his character in the fanfiction either entertaining or a bit off - mark.
When it comes to reading Endgame fanfiction, the Avengers' reactions are diverse. Thor, with his jovial nature, would likely enjoy the creative liberties taken in the fanfiction. He may even be inspired by some of the new storylines. Steve, being the more traditional and values - oriented one, may have a hard time accepting fanfiction that goes against the moral code he adheres to. Tony would approach it with a mix of amusement and scrutiny. He would be entertained by the creativity but also quick to point out any flaws in the logic or characterization. Natasha would be on the lookout for how her character is developed in the fanfiction, hoping for accurate and strong portrayals, while Bruce would be intrigued by the scientific concepts, whether accurate or not, that are explored in the fanfiction.
The characters are often filled with grief. They see their friends and comrades die in Endgame, and this can bring out deep sadness. For example, Thor might be even more broken - hearted seeing his brother Loki's death again. Captain America could feel a sense of guilt, thinking he could have done more to prevent some of the deaths.
Some characters would likely be entertained. For instance, Loki might enjoy seeing the various ways fans write him as a more complex anti - hero. He'd probably find the creativity in the fanfiction quite appealing.
Characters might also be a bit critical. They know their world and themselves better than the fanfiction writers. So they could be nitpicking at inaccuracies or things that don't quite fit with their personalities. But at the same time, they may also be impressed by the creativity and passion that goes into creating these fanfictions.
There could be characters who are outraged. If the fanfiction distorts their personality or makes them do things completely against their nature, they may be very angry. For example, a noble character made to act like a coward in the fanfiction would likely not take it well.
Characters may have different reactions. For example, if a character is normally shy in their original story but the fanfiction portrays them as a bold adventurer, they might be initially taken aback. But then they could start to think about that different side of themselves. Or if a character is a villain in the original and the fanfiction gives them a redemption arc, they might feel a sense of hope or confusion about this new view of themselves. They may also get excited to see new plotlines and relationships that fans come up with.
When characters watch reviews, they may experience a range of emotions. A character who is insecure might be deeply affected by negative reviews and might even question their own worth or actions within the story. In the case of fanfiction, they could be in awe of the fans' imagination. They might see new possibilities for their own character development that they hadn't considered before. However, they could also be very protective of their original story and not like some of the liberties taken in the fanfiction.
There could be characters who are skeptical. They might not believe what they read in the fanfiction about their future and dismiss it as just some wild imagination. After all, it's not part of their official story. For example, a very traditional and by - the - book character might not give any credence to the fanfiction's version of the future.