What type of narrator would an author use if he or she wanted to focus on the thoughts and feelings only one character?

An author would use a first-person narrator if they wanted to focus on the thoughts and feelings of only one character.

Here's why:

* Limited Perspective: First-person narration is inherently limited to the perspective of the character telling the story. The reader only sees and knows what the narrator does.

* Intimate Access: This allows for a deep dive into the character's inner world, their fears, hopes, and motivations.

* Subjective Experience: The reader experiences the story through the narrator's eyes, understanding events based on their interpretation.

Example:

"I stared at the dusty mirror, my reflection a stranger. It felt like years had passed since I last saw myself. My face was gaunt, the shadows beneath my eyes deepened. The thought of facing him filled me with a cold dread."

This example shows how the first-person narrator allows the reader to directly access the character's emotional state and internal thoughts.