Father Night is the ancient god that the Night Breed worship. He communes with the Night Breed in a very fatherly way. He is their creator and  active in all aspects of their lives. To sum Father Night up in short blurb is impossible. He is as much a character in the books as any of the Night Breed. He is like the umbrella under which they all live and survive. He loves and is loved. He mourns for their losses and he celebrates their lives. He created a way for them to find love and to live. The Night Breed are his children.