Most of the mecha of Orguss don’t conform to the standard humanoid or fighter craft configurations of most anime. Many of them have (or transform to) a hybrid form with reversed knee joints called GERWALK. GERWALK is an acronym that stands for Ground Effective Reinforcement of Winged Armament with Locomotive Knee-joint. The GERWALK form allows flight, VTOL (vertical take off and landing) and walking on the ground. This is the most effective form for a world as unstable as the Earth is after the Time/Space Bomb is detonated.
The mecha can be grouped into four main categories: