Answer:
antagonist
Explanation:
-Protagonist refers to the main character of a story.
-Bad guy refers to a person that is considered to be evil.
-Detractor refers to a person that criticizes someone else in a way that is considered unfair.
-Antagonist refers to the character that is against the protagonist of the story.
According to this, the answer is that the character who is in conflict with the main characters in a story is called the antagonist.