No, Bucky didn't kill the Starks in the comics.
Yes, he did. It was a significant plot point in the comics.
Yes, Bucky did kill Tony's parents in the comics.
Well, it depends on the specific comic series. In certain story arcs, Bucky is shown to have a role in that tragic event, but it's not a constant across all comics.
Yes, Bucky did kill Tony Stark's parents in the comics.
The Starks' deaths in the comics were often a result of various complex plotlines and conflicts. Sometimes it was due to betrayal, while other times it was from powerful enemies.
Well, if that happened in fanfiction, it would likely create a major rift within the superhero group. It could also lead to some intense action sequences and emotional moments as Tony tries to defend himself and understand Bucky's motives.
Yes, Bucky was depicted as bi in some comic storylines.
In certain comic arcs, Bucky's character is presented as gay. This adds diversity and complexity to his portrayal.
Yes, Bucky is depicted as bisexual in some comic storylines.