Yes, the narrator can be a major character. Example: in the Nero Wolfe mysteries, the story is told by Wolfe's factotum, Archie Goodwin. In Ned Beach's wonderful submarine stories, the narrator is usually the captain of the boat.
One of the main reasons is because with a first person narrator, the reader gets to hear his/her thoughts and motivations. This usually means that we, as readers, become more involved in the personal story of the character.
The third person with one character is called a limited narrator
The character in the story is a first-person narrator, as they are telling the story from their own perspective using "I" and "me."
Kevin Spacey's character, Lester Burnham, is the narrator.
narrator
The narrator in the scarlet ibis is a dynamic character because he realizes the at points he is mean and selfish with his brother
Narrator
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If the narrator says "I did this..." then it is 1st person If the narrator says "You did this" it is 2nd person and if the narrator says "He/She/They did this" then it is 3rd person.
The term for the point of view in which the narrator is a character in the story is called first-person point of view.
Montresor, the narrator, is the main character. and fortunato is the other main character