The Avengers' reactions to finding out about Steve and Bucky in fanfiction would be diverse. Bruce might be more analytical and wonder why fans would write such things. Wanda could be empathetic and see it as a creative expression of the bond between Steve and Bucky. Vision, on the other hand, might try to understand the cultural significance of fanfiction in relation to the two heroes. Steve would likely need some time to get used to the idea that there are fictional stories out there about him and his best friend.
Thor would be quite confused at first. Fanfiction is not something from Asgard. But once he gets the gist, he might say something like 'This is a strange Midgardian custom, but if it shows the great friendship of Steve and Bucky, then it is not all bad.' Meanwhile, Tony would be all over Steve, making snarky comments and asking if he's finally going to admit to some hidden feelings for Bucky according to the fanfiction.
I really like 'Bucky's Redemption'. In this fanfic, Bucky is on a journey to fully come to terms with his past actions while Steve is there to support him every step of the way. It shows their loyalty to each other in a very touching way. There are some intense emotional moments as Bucky struggles with his guilt and Steve tries to pull him out of the darkness.
Well, it could go a few ways. Maybe they'd be shocked at some of the wild interpretations of Bucky in the fanfiction. Some might find it funny, like Thor could chuckle at the strange scenarios Bucky is put in. Others, like Steve, might be a bit protective and not like some of the more out - there ideas about his friend.
The Avengers' reactions would be diverse. Captain Marvel, if she's part of the group, might be very matter - of - fact about it. Rhodey could be a bit bemused. Steve and Bucky, in the meantime, would be dealing with the embarrassment of being caught in what might be a very personal moment. The situation could also lead to some new conversations within the Avengers about personal boundaries and relationships among the team members.
Well, they might be really surprised. Some of them could be confused at first. Tony might make a snarky comment like 'What's going on here, boys?'. Natasha would probably just raise an eyebrow and wait for an explanation. And Thor might not fully understand the situation but would try to lighten the mood with a joke.
One common theme is loyalty. Steve and Bucky have a deep loyalty to each other that has withstood time and trauma. Another is redemption. Bucky's journey from being the Winter Soldier to finding himself again is often explored. Friendship is also a big theme, as their bond is one of the most important aspects of their relationship in these fics.
One popular trope is 'Friends to Lovers'. Given their long - standing friendship, many fanfictions explore the idea of Steve and Bucky's relationship evolving into something more romantic. Another is 'Redemption Arc' for Bucky, as he tries to make up for his past misdeeds with Steve by his side. It makes for a very emotional and engaging read.
It might not change much for some. For example, Bruce would probably still see Bucky as the same person he knows. But for others, like Sam, if he reads some fanfiction where Bucky is painted in a bad light, he might be more on guard around Bucky at first, until he realizes it's just fictional nonsense.