Wald Ren operates as the tactical backbone of the Southern Cross Corps, the Principality of Zeon’s elite mobile suit unit. A veteran of Cucuruz Doan’s squad before its dissolution, he rises to deputy leadership under Egba Atler, leveraging his expertise in long-range combat. His customized MS-06GD Zaku High Mobility (Surface Type), armed with a high-caliber anti-ship rifle, proves lethally effective during the Casablanca engagement, where he systematically dismantles Federation GM units.

Assigned to secure a dormant nuclear trigger at Alegranza, Wald speculates that Doan’s shadow looms over the mission, raising tensions among his comrades. Forced to abandon his cockpit to manually arm the missile system, he completes the activation sequence only to return to a fatal confrontation: Amuro Ray’s Gundam, having neutralized his ally Yun Sanho, intercepts his retreat. Wald’s desperate escape ends abruptly as the Gundam crushes his Zaku, marking him the third Southern Cross casualty.

The launched missiles detonate prematurely, their failure later traced to Doan’s covert interference. Wald Ren’s documented actions remain confined to these events within *Mobile Suit Gundam: Cucuruz Doan’s Island*, with no supplementary appearances or elaborated backstory in extended universes.