Nagini is the secretly, secondary antagonist of the Harry Potter book and film series, but primarily are given a role as the tertiary antagonist of the series. She is the pet to Lord Voldemort, and a green, serpentine snake. She appeared as a senary antagonist of Goblet of Fire, a minor antagonist of Order of Phoenix, and the tertiary antagonist of both Deathly Hallows-Part 1 and Part 2.
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