Antagonist

Antogonist - An antagonist (from Greek ἀνταγωνιστής - antagonistes, "opponent, competitor, rival"[1]) is a character, group of characters, or an institution, that represents the opposition against which the protagonist must contend. In other words, 'A person, or a group of people who oppose the main character, or the main characters.'[2] In the classic style of story where in the action consists of a hero fighting a villain, the two can be regarded as protagonist and antagonist, respectively.[3] The antagonist may also represent a major threat or obstacle to the main character by their very existence, without necessarily actively targeting him or her.