What is the method a writer uses to reveal the personality of a character in a literary work?

What would we call a character who is multi-dimensional like a real human?

Who is the hero or central character of a literary work?

What is the second section of the typical plot in which the main character begins to grapple with the story’s main conflict?

What is internal conflict?

What type of character undergoes a change from the beginning of the story to the end?

A character who undergoes no change from the beginning to the end of a story is what type?