Rochefort serves as a key antagonist for Cardinal Richelieu, commanding as captain of the Cardinal's guards. He executes Richelieu's schemes, frequently targeting the Musketeers and their allies. Distinctive physical markers, including an eyepatch signifying a half-blind condition and facial hair, define his recognizable appearance.

Introduced as a formidable adversary, Rochefort engages D'Artagnan in direct confrontations, stealing his letter of recommendation early on to establish their ongoing rivalry. His antagonistic role involves coordinating pursuits and ambushes against the main protagonists, often alongside his subordinate Jussac. Despite his serious threat status, interactions involving failed plans or humorous mishaps, like causing traffic disruptions with livestock during pursuits, provide elements of comic relief.

Rochefort maintains unwavering loyalty to Richelieu throughout the series, acting as one of the Cardinal's primary enforcers alongside Milady de Winter. His role evolves during the Iron Mask storyline, demonstrating unexpected flexibility when imprisoned with Athos. He participates in a collaborative escape attempt, forming temporary alliances against greater threats, including aiding efforts to prevent King Louis XIII's wrongful execution. This highlights his capacity for situational cooperation despite his core antagonism.

He undergoes no significant redemption or profound personal growth, remaining aligned with the Cardinal's faction until the end. The narrative prioritizes his function as a persistent obstacle for the Musketeers over exploring extensive backstory or internal development.