Unlike the original Zeta Gundam, Red Zeta's armor sports a heavily 'spiked' look. Equipped with the Psyco Neutralizer, its cockpit can change from a standard panoramic cockpit and linear seat by retracting the seat and manual controls. This leaves the pilot free-standing (or floating, in zero-g environments), with their head in a hollow, transparent, hemispherical device, and a number of cables attach from the seat into the back of the pilot's flight suit. In this mode, the movements of the suit follow the pilot's own movements.
The Psyco Neutralizer is actually an advanced model of the Bio-Sensor, allowing the pilot to fully control the MS with precise movement. This system also allows the pilot to psychically interfere with other Newtype weaponry, such as when Yurii managed to take control of the QRX-006 Geminus's arm and used it against the mobile armor. However, the system is highly unstable and can be overloaded by powerful psycowaves. The unit can be equipped with a (colour-matched) single-stage booster system, allowing the Red Zeta to make orbit otherwise unassisted. The Psyco Neutralizer is considered exceptionally advanced for Gryps Conflict-era technology, and as a result, some people question its existence.
After the Gryps Conflict, three more Zeta Gundams were made and assigned to AEUG for wiping out Titans remnants. The Zeta Gundam P2/3C Type was piloted by a young Newtype girl named Yurii Ajissah (Codename: "Red Snake"), who holds her squadron leader, White Unicorn, in high regard. The mobile suit was original intended to be piloted by Johnny Ridden, but he was replaced by Yurii since it required a Newtype to operate. By fully mastering the power of the Psyco Neutralizer system, Yurii managed to destroy the monstrous QRX-006 Geminus, although the Red Zeta was heavily damaged during atmospheric re-entry.