Riobaldo is the main character in the novel "Grande Sertão: Veredas," written by Brazilian author Guimarães Rosa. The story is set in the Brazilian hinterlands and follows Riobaldo's journey as a jagunço, or hired gunman, navigating the complexities of love, loyalty, and violence in a harsh landscape. Throughout the narrative, Riobaldo reflects on his life, relationships, and the philosophical questions surrounding fate and existence. His encounters with various characters, including the enigmatic Diadorim, shape his understanding of the world and his place within it, making the novel a rich exploration of human experience.