Auguste is a minor but significant character in Le Chevalier D'Eon, depicted as the Dauphin of France. He is the crown prince who would eventually become King Louis XVI, known to history as the husband of Marie Antoinette. In the narrative, he is a young prince under the care of his governess, Anna Rochefort, who is also the betrothed of the protagonist, D'Eon de Beaumont.

Regarding his background, the series establishes Auguste as the grandson of the reigning monarch, King Louis XV, placing him directly in the line of succession. His role in the story is primarily that of a figure representing the future of the French monarchy, a symbol of the established royal order that various factions within the series are either trying to protect or subvert. Information about his personality, personal motivations, key relationships beyond Anna, character development, and notable abilities is not provided in the available records. He appears in the series' opening sequence, where he is shown standing between two portraits, including one of himself as an adult king painted during his historical reign in 1788.