A variant of the ZGMF-1000 ZAKU Warrior equipped with the Wizard System's EX-A1 Gunner Wizard on its back. The Gunner ZAKU Warrior is specialized for artillery strikes, and its main weapon is the M1500 "Orthros" high-energy long-range beam cannon mounted on the Gunner Wizard. This beam cannon is the strongest ranged weapon available to the ZAKU Warrior and grants it impressive firepower over long ranges, capable of destroying any mobile suits or mobile armors within its line of fire.
One custom red-colored Gunner ZAKU was used by ZAFT red elite pilot Lunamaria Hawke, who is one of the pilots stationed aboard the new battleship Minerva. Lunamaria and her suit were thrown early into serious battles, when three prototype Second Stage Series Gundams are stolen from the ZAFT colony Armory One by Earth Alliance special forces team Phantom Pain. As a result, Lunamaria and her ZAKU fought several times against the stolen Gundams while pursuing them to Earth. When the Minerva descended to Earth and the Second Alliance-PLANT War began, Lunamaria's ZAKU was most times used as a fixed turret standing on board the Minerva while shooting down enemies.