Saburou Koyama, nicknamed "Gara," operates as the expedition team’s radio specialist, tasked with the critical role of monitoring mission communications and maintaining operational contact via the Seagull helicopter during reconnaissance patrols. His lanky frame, sharp features, and perpetually tousled black hair mirror his cautious disposition, often voicing concerns over potential hazards or mission complications. While his wary outlook contrasts with teammates’ optimism, he demonstrates unwavering dedication to protocol, swiftly coordinating responses to environmental threats or hostile encounters through precise radio directives.

Clad in the team’s standard uniform, his attire is distinguished by a green ascot and the embroidered brachiosaurus emblem symbolizing their unit. During operations, his focus remains on real-time situational updates, balancing vigilance with disciplined adherence to collective objectives despite his inclination to anticipate risks.