Who is Mustafa Sa'eed from Season of Migration to the North and what is their importance?

Mustafa is one of the men in the village who arrived several years after the Narrator's departure. He married one of the village women. Since he is a stranger to the Narrator, he is very curious about the man. Mustafa is of the opinion that their country needs educated people to aid in its advancement. He doesn't see the Narrator's work in literature as being in the right area. Mustafa had had his own business in Khartoum but decided he wanted to go into agriculture. He is an only child who grew up in Khartoum without a father or any other relatives but his mother.