Who is Charles Hayman from Richard Brautigan's Trout Fishing in America ; the Pill Versus the Springhill Mine Disaster ; and, in Watermelon Sugar and what is their importance?

Charles Hayman is a character in Trout Fishing in America. In 1976, Charles builds a shack near a creek to fish for trout. He is described as "a sort of half-assed pioneer in a country that not many wanted to live in because it was poor and ugly and horrible." Hayman's diet consists of stone-ground wheat and kale. He dislikes children.