How does the choice of a narrator affect the characterization and credibility of the text?

Responses may vary but should include some or all of the following information:

The point of view of the narrator is first-person, so we get the inner thoughts and actions of one character. This particular character is telling the story of his childhood, so we must rely on him to give us reliable information. When the point of view is first-person, it is inevitable that the narrator gives us biased information because he or she only sees things from one perspective and experience. For example, the character was born with issues with his brain, so it’s a fact of life for him. As a result, his tone is flippant and humorous rather than serious. He even says, sarcastically, that his family members must have thought it was funny when he had to have brain surgery as a baby. His sarcasm hides any negative emotion he has about the surgery and hints that his family was upset. Yet, due to the narrator’s personality and limited point of view, we can only be confident in what he actually reveals.