Agent S is a character from the anime Dragon Drive, known for being a mysterious member of the organization RI-ON. He is a male human with brown hair and gray eyes, though some sources describe his hair as gray, presenting an adult appearance. His role within the series is primarily defined by his partnership with another operative, Agent L, with whom he shares a close friendship.

Very little is revealed about Agent S's past or personal background. His personality is depicted as enigmatic, with few details known about his inner self. A chain smoker, Agent S is also distinguished by his exceptional skills as a computer programmer, which serve as his primary contribution to the plot. His motivations appear tied to his loyalty to his partner and a subtle inclination towards subverting his own organization's strict protocols when he deems it necessary.

Within the story, Agent S operates as a double agent, walking a fine line between his duties for RI-ON and his allegiance to Agent L. His most significant action occurs when he follows orders from Saizou Toki to load a dimensional portal for the protagonists Kohei and Hideaki, enabling their return to Earth. However, demonstrating his covert loyalty, he simultaneously uses his programming abilities to unlock the code that was keeping Agent L imprisoned in a storage room.

In terms of character development, Agent S's arc concludes in the epilogue of the series. He attempts to use his technical expertise to alter the system that matches Dragon Drive players with their dragons. His goal is to reprogram the system that relies on personality data, specifically to prevent the dragon Chibi from being forced to participate in Dragon Drive ever again. This effort ultimately fails, as the system still ends up matching Chibi with the main character, Reiji Ozora. Agent S's notable abilities therefore center almost entirely on his prowess as a superb computer programmer and hacker, skills he wields to manipulate the technology that underpins the Dragon Drive world.