Antagonist: The person in a piece of literature that contends (0r goes against or battles against or opposes) the protagonist, the main character
Protagonist: The main character in a literary piece of work. Protagonist is a term used to refer to the figure or figures in literature whose intentions are the primary focus of a story. Classically protagonists are derived from good will, however, this does not always have to be true. Protagonists cannot exist in a story without opposition from a figure or figures called antagonist(s).