What is a person in a fictional work that is well-developed by the author?

Answer: Round Character

Explanation: A character in a fictional work that is well-developed by the author is called a Round Character, because the character is rounded out, meaning they are well-developed, complex, and often change or go through some sort of development somehow during the story. A Round Character is also known as a Complex Character, or a Dynamic Character.

round character.

Explanation:

This type of character is called a round character, because their story and personality are rounded out.