Professor Go Gakujin, a scientist and strategist for the Experts of Justice, dedicates his expertise to mastering Shizuma Drive technology. A survivor of the Bashtarle Tragedy—a disaster tied to the Drive’s development—he carries the weight of guilt from the event, which he endured alongside Genya and Dr. Franken von Fogler. This past fuels his resolve to thwart future catastrophes and oppose the BF Organization’s threats.

Calm and reserved, he wields oversized war fans in combat, deploying the "Iron Fan" technique to parry strikes and unleash calculated counterattacks. His eyes, perpetually narrowed, snap open only in rare bursts of intensity, such as when safeguarding the Shizuma Drive’s legacy. As a leader within the IPO’s Beijing division, he orchestrates missions and spearheads technological defenses against adversarial forces.

Once a protégé of Professor Shizuma, the Drive’s creator, he now upholds the late scientist’s research while seeking redemption for Bashtarle’s fallout. This dual pursuit of innovation and atonement cements his role as the group’s moral compass, tempering strategic ruthlessness with a quiet yearning to correct past mistakes.

Though mentoring younger agents, he avoids overt camaraderie, favoring intellectual discourse and terse guidance. His confrontations with adversaries linked to Bashtarle exude steely resolve, channeling trauma into tactical precision. The tragedy’s unresolved impact on global energy infrastructure continually shadows his choices, driving alliances and strategies in the ongoing conflict.