Who is Radwan Hussainy from Midaq Alley and what is their importance?

Radwan Hussainy is an impressively tall, broad man with a pinkish-red, glowing face and reddish beard, Hussainy wears a flowing black cloak and perpetual look of happiness, tolerance, and deep faith. He walks slowly and his smile announces love for people and life. He never lets a day pass in which he does not do some good deed for the unfortunate. He owns a house on the right side of Midaq Alley and takes less rent than he is entitled to under the laws of military occupation from tenants Kirsha, Uncle Kamil, and Abbas. His failure to graduate from the University of al-Azhar and loss of all his children nearly choke him with despair, but his faith restores him and he becomes a source of consolation to all.