Who is Nwibe from Girls at War, and Other Stories and what is their importance?

Nwibe is a pillar of his community with two wives who are forever at each other's throats. At the beginning of The Madman, approaches the ozo men of his village with a proposal that he should be admitted into their hierarchy. They tell him they must wait to see now his fortunes progress. Nwibe knows that he will follow up on his business plans.