In comics, while Bucky has taken on the mantle of Captain America at certain points, it's not a permanent or default status. Steve Rogers is the original and most commonly associated Captain America.
Bucky has become the new Captain America in the comic. This transformation often brings new dynamics and challenges to the story, as Bucky navigates the responsibilities and expectations that come with the mantle.
Sure, Bucky has been Captain America in the comic universe. This happened after specific storylines and events that led to the passing of the mantle or under special circumstances.
Yes, Sam Wilson has been depicted as Captain America in the comics. It's an interesting development that showcases a shift in the character's legacy and representation.
A fanfiction could focus on an alternate universe where Bucky becomes Captain America instead. He has to deal with the same ideals but in his own unique way, while also having to face Steve Rogers in a different role, perhaps as an advisor or a reluctant ally. This would create a lot of interesting character dynamics.
In the comics, Bucky didn't become Captain America. Captain America has mainly been associated with Steve Rogers. However, Bucky has had significant storylines and developments of his own.
It depends on the specific comic series and story arcs. In some, Sam Wilson remains Captain America, but comic storylines are constantly evolving and changing.