Answer the brackets are correct because we already know about which guy we are talking about and the information in the brackets is additional and therefore not needed.
The authors purpose is what the author wants the reader to understand. That’s the purpose why the author wrote what he/she wrote. I hope that makes sense!!
The protagonist is the main/leading character and the antagonist s usually a character or a group of characters that oppose the story's main character, who is known as the protagonist.
