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I think that the answer depends on whether this is a, or the, main character in the story. The main character or main plot-driving character is the protagonist. Someone who opposes their goals is ...
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Source: https://writers.stackexchange.com/a/39589 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think that the answer depends on whether this is a, or the, main character in the story. The main character or main plot-driving character is the protagonist. Someone who opposes their goals is an antagonist--and often there is a "the antagonist" vibe, where the primary character opposing the protagonist is "the" antagonist. Now, it's not always this neat. _Bill and Ted's Excellent Adventure_, for example, arguably has two protagonists. In the 1993 _The Fugitive_, Tommy Lee Jones' character is arguably the antagonist, except toward the end he turns around and he's helpful. In _The Great Gatsby_, the main plot-driving character, Gatsby, is separate from the character that we identify with, Nick Carraway. And so on. Nevertheless, I think that the designation of protagonist/antagonist depends on who the main plot-driving character is, whether the character you're trying to classify tends to champion or sabotage their goals, and how important that character is.