Noriyuki Yaginuma commands the Gutsy Galaxy Guard's Orbit Base during the period immediately following Koutarou Taiga's reinstatement as Space Development Corporation president. His personality starkly contrasts with Taiga's, defined by a reserved, unhurried nature. He seldom exhibits excitement and moves with deliberate slowness, yet harbors profound trust in his subordinates. This trust frequently overrides his inherent caution, leading him to endorse their proposed actions.

Within GGG's hierarchy, Yaginuma manages bureaucratic operations from the Main Order Room. His methodical style surfaces through strict adherence to protocol, notably employing a personal seal to authorize critical measures like Final Fusion during emergencies. Bridge crews often press him to hasten approvals, prompting his characteristic response: "Well, if you all say so..." He then deliberately rises, prepares his stamp, and applies it after meticulous consideration. This ritual gently satirizes traditional Japanese bureaucratic figures without obstructive intent. Despite the comically slow pace during crises, he consistently sanctions necessary actions once persuaded by his team, serving as a pragmatic authority who enforces proper procedure.

Yaginuma displays unshakable composure under duress, retaining his trademark calm even against universe-level threats. His unflappable demeanor and procedural rigor remain constant regardless of crisis magnitude, underscoring nerves of steel. Post-Primeval War, he was relieved of duty in 2007 for aiding Taiga and GGG members during their unsanctioned Trinary Solar System mission. After Yang Long Li's interim leadership, Yaginuma regained his post. His tenure concluded in 2017 when Shishioh Gai became acting chief, preceding Taiga's return as Special Chief overseeing GGG Green and GGG Blue.