The character that is usually opposes the protagonist is the antagonist.
Who is an antagonist?
An antagonist can be regarded as a character in a story that usually act as the chief foe of the protagonist.
The antagonist can appears inform of a single character, and sometimes inform of group of characters. Example is the Iago from Shakespeare's Othello.
Therefore, a antagonist are usually involved in a play to opposes the protagonist.
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