Jussac serves as the commander-in-chief of Cardinal Richelieu's guard, a position that places him as a direct obstacle to the king's musketeers. He is a man of action, consistently operating in the field to carry out the Cardinal's orders rather than remaining in a position of authority. His allegiance is firmly with the Cardinal's faction, and he acts as a reliable enforcer for its various schemes and operations. In the television series, Jussac functions as a steadfast subordinate, often appearing alongside Captain Rochefort and acting as his right-hand man. Their partnership is a defining feature of his role, with the two characters frequently working together to pursue, confront, or attempt to capture the protagonists, including D'Artagnan and the other musketeers.

While generally a serious and antagonistic figure, Jussac is also involved in moments that introduce a lighter tone to his character. For instance, during a chase with Rochefort, the pursuit is comically thwarted by a flock of sheep blocking their path, an incident that leads to Rochefort losing his temper while Jussac is present. His personality is largely defined by his unwavering loyalty to his superiors and his duty, lacking significant personal traits or a distinct backstory within the narrative. His motivations are straightforward and tied directly to his position; he acts in service to the Cardinal and later, following a shift in the power structure, takes orders from a character named Manson after Richelieu is imprisoned.

Within the story, Jussac occupies the role of a secondary antagonist, providing consistent opposition to the musketeers. His presence reinforces the authority and reach of the Cardinal's guard, and he participates in various plots against D'Artagnan and his friends. In the concluding movie, Anime Sanjuushi: Aramis no Bouken, which takes place one year after the television series, Jussac and the Cardinal's guards are seen harassing a woman in a Parisian tavern. This action directly leads to a confrontation where the musketeers fight and defeat him and his men, setting the mystery of the film's plot into motion. Jussac does not undergo significant character development or have a personal character arc across the series. He remains a consistent representative of the Cardinal's forces without any notable change in personality or allegiance. His abilities are those expected of a captain in the Cardinal's guard, primarily demonstrated through his leadership of his men and his participation in direct combat and field operations. No specific details about his sword fighting style or other unique skills are provided.