In Shakespeare’s Romeo and Juliet , Tybalt is an antagonist because he is a

An antagonist is a character who opposes the protagonist or creates obstacles and conflict in the story. Tybalt’s hostility toward Romeo and the Montagues adds conflict to the play, so “contrary character who creates conflict” best describes him. He is not Romeo’s teacher or faithful servant, and the term does not mean a main character facing a challenge.

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