1. Narrator
The "voice" that speaks or tells a story. Some stories are written in a first-person point of view, in which the narrator is a character telling the story and third-person, where the narrator is outside the story telling it to the audience.

2. Naïve Narrator Forrest Gump (1994) Huckleberry Finn (1885)
An uncomprehending character in a work of fiction who narrates the story without realizing its true implications. The result is that the reader knows more about what is actually going on than the narrator does. An uncomprehending character in a work of fiction(a child or simpleminded adult) who narrates the story without realizing its true implications.
Forrest Gump (1994)
Huckleberry Finn (1885)

3. Naïve Narrator
In Forrest Gump, Forrest Gump is the naïve hero who is honest and innocent, he doesn’t understand the ramifications of his own observations, yet the audience does.
Mark Twain's character Huckleberry Finn is a child and doesn’t understand the world so he is of course a naive narrator.

4. Unreliable Narrator
A storyteller or character who describes what he or she witnesses accurately, but misinterprets those events because of faulty perception, personal bias, or limited understanding. A narrator that is not trustworthy, whose rendition of events must be taken with a grain of salt.

5. Unreliable Narrator
An unreliable narrator is a narrator whose credibility is compromised. The use of this type of narrator is called unreliable narration and is a narrative mode that can be developed by the author for a number of reasons, though usually to make a negative statement about the narrator. This unreliability can be due to psychological instability, a powerful bias, a lack of knowledge, or even a deliberate attempt to deceive the reader or audience.