Who is Narrator from Season of Migration to the North and what is their importance?

The Narrator is the character in the novel that is chosen to tell the story of Mustafa Sa'eed. He is never given a name and is always referred to as 'he' or 'him'. He is from a small village in Sudan located on the Nile River. He left his family and the closeness of his tribe to attend school in Europe, where he received a doctorate in literature. He returns to his village and family after completing his studies and his acquaintance with Mustafa Sa'eed begins.