Redemption is also a big theme. For example, characters like Zemo might be given more of a redemption arc in fanfiction. And of course, the theme of heroism. Writers may put the characters in different situations to show their heroic qualities in new ways. There's also a lot about the characters' pasts, how they came to be who they are, and how their pasts affect their present actions in the fan - created stories.
One popular website could be Archive of Our Own (AO3). It has a large collection of fanfictions for 'Falcon and the Winter Soldier'. Another option might be Fanfiction.net, which also hosts a variety of fan - created stories related to the show.
One character that would be interesting to include is Isaiah Bradley. His story is so rich and tragic, and his connection to the super - soldier program could bring a whole new layer of depth to the fanfic. Additionally, Agent 13 could be included. She could be involved in some sort of political intrigue that Falcon and Winter Soldier have to navigate through. And Redwing! Sam's trusty drone could have its own sub - plot, like getting hacked and Sam having to rescue it.
In the original story, it focuses on the relationship between Falcon and Winter Soldier. Falcon is a hero in his own right, with his flight abilities and combat skills. Winter Soldier, Bucky Barnes, has his own complex past as a brainwashed assassin. The story often involves them dealing with threats both from their pasts and new emerging enemies while trying to find their place in a post - Captain America world.
An old war veteran who has knowledge of some long - forgotten secrets related to the super - soldier serum. His knowledge could be crucial for Falcon and Winter Soldier in their fight against a new enemy that is also interested in the serum.
One idea could be a story where Falcon and Winter Soldier have to team up with an unexpected ally from their past. Maybe an old enemy who has a change of heart and holds the key to stopping a new threat.