A four-year-old girl whose severe illness motivates her family's travel in search of treatment. Her vulnerability underscores the family's urgent efforts to care for her.

An employee of the Zeppelin Company, known for his kindness and intelligence, who is traveling with his daughter. His role aboard the Hindenburg involves more than what appears on the surface.

A menacing figure known for his imposing presence and loyalty to the political context of the time. He creates tension with his intimidating demeanor and mysterious mission.

A vibrant and outgoing young girl who befriends Hugo on the journey. Her familiarity with airship travel provides a contrast to Hugo's serious concerns.

Hugo’s supportive and protective parents, whose main objective is to ensure the safety and health of their children during their voyage.

Fellow passengers aboard the Hindenburg who contribute to the lively discussions that help set the story's tone and background.

The Ballard family's loyal dog, who provides comfort and companionship to the family. His presence plays a part in Hugo's discovery aboard the airship.