The S Gundam was a very heavily armed and armored mobile suit. Constructed from Gundarium γ alloy composite, it was able to take a physical pounding that would destroy a lesser mobile suit, which would come in handy with Ryou Roots's poor piloting skills. The S Gundam was a fourth generation MS developed by Anaheim Electronics following the MSZ-010 ΖΖ Gundam. Although it employs a core block system that shares similar features such as a system that allows independent operation of separated units, its design concept is fundamentally different from the ΖΖ Gundam.
The S Gundam was built on a modular design, made up of two separate transformable high speed fighter crafts that could combine with a FXA-08GB G-Core core fighter to create the full mobile suit. The first fighter craft was called the G Attacker (also referred to as the A Parts), which was made up of the upper torso area of the S Gundam. The second fighter craft was called the G Bomber (also referred to as the B Parts), which was composed of the lower torso and legs of the S Gundam. Both fighter crafts could be controlled by ALICE if there were no pilots in either of their cockpits. The G-Core, which was the C Parts, was flown by Ryou Roots. Like the MSZ-006 Zeta Gundam, the S Gundam has a pair of generators housed in each legs, with an additional pair installed on the shoulders.