Antagonist
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Character Role Analysis
Voldemort
Voldemort has been trying to thwart, attack, and kill Harry and his family since Harry was an infant. That's some seriously nasty antagonism, if you ask us.
Puns aside, you know it's true: Voldemort has been the Big Bad since the beginning of the series—and since this is the big showdown between Voldemort and Harry, the two sides of the antagonist/protagonist divide are played up even more than usual. Which is saying something, because the franchise has been pretty heavy on the whole "good vs. evil" thing.