Born Micah True, he is a central figure known for living among the Tarahumara people and organizing a notable ultramarathon. His enigmatic character attracts the attention of many, including fans of the book.

A highly respected Tarahumara distance runner who plays a significant role in the ultramarathon organized by Caballo Blanco. He is known for his impressive wins in local races.

A Tarahumara runner who competes in the Leadville 100 and forms a bond with one of the American runners. He is the father of Marcelino Luna, who also features in the narrative.

A wilderness photographer who played a role in bringing the Tarahumara people to compete in the Leadville Trail 100. His actions and personality contributed to controversy surrounding the event.

A renowned track coach interested in the endurance running secrets of the Tarahumara. He seeks to understand the dynamic of gender in ultrarunning.

An accomplished ultrarunner known for her dominant performances in 100-mile races. She is a central figure in the narrative about the Tarahumara competing in American ultras.

Czech Olympic champion applauded for his extraordinary achievements in distance running during the 1952 Helsinki Olympics. He is referenced as a model of resilience and love for running.

A celebrated American ultrarunner who takes part in the Copper Canyons race arranged by Caballo Blanco. Known for his achievements in the ultra community, he joins the race out of curiosity.

A young pair of American ultrarunners notable for their presence in the ultra circuit. Their story includes an episode of getting lost during a challenging training run before the big race.

Known for advocating barefoot running, he competes in the Copper Canyons race. His unconventional approach and adventurous spirit create tension and intrigue during the journey.