Who defines the concept of "Fifth Business" for the protagonist, Dunny?

In "Fifth Business," the concept of "Fifth Business" is specifically articulated through the character of Amasa Dempster. He represents a pivotal figure in Dunny's life, illustrating the dynamics of a "fifth business" role within the context of a narrative. This concept refers to a character who is not the hero, heroine, or villain, but plays an essential role in the unfolding drama, often serving as a catalyst for the development of other characters. Amasa Dempster embodies this role for Dunny, as he shapes Dunny's understanding of himself and his place in the world, symbolizing the complexities of personal identity and the interconnectedness of their lives.

Dunny's reflection on Amasa’s influence encapsulates the philosophical underpinnings of the story, showcasing how secondary characters significantly impact the central narrative. This insight reinforces the theme that every individual's contribution is vital, even if they do not take center stage. The other characters listed do not explicitly define this concept for Dunny, even though they may have significant roles in his life.