Like the Gundam Barbatos, the Gundam Gusion Rebake had severe damage through repeated battles, so it was upgraded into a new form by Teiwaz. The process utilized the recently acquired mechanical data from the Calamity War era, restoring the suit's original performance, and combined it with equipment feedback based on Akihiro's combat records. As a result, the Gundam Gusion Rebake Full City is a hybrid of old and new. Its exterior and equipment are all brand new, but it retains the basic structure and functionalities of its predecessor such as the sub-arms, the high sensitivity sensor in the head, and alternate head modes.

The revision of the suit's equipment also improved the transfer rate of the huge energy generated by its two Ahab Reactors. New weapons added included those that are more specialized for close combat, as Akihiro had requested for enhanced close combat capabilities. The suit’s handheld armaments change according to needs, allowing it to flexibly adapt to close or ranged combat. With its capabilities in both ranged and close combat, as well as the usefulness of the sub-arms, the suit can be used in a wider range of tactics than other mobile suits.