Psycho Gundam is considered a mobile armour because of it's huge size. This state of the art machine that is transformable from flight mode to robot mode and has weapon of mass destruction that is able to shoot laser beams from the abdomen and fingers.
Unlike most MS whereby the cockpit is located at the chest area, the cockpit of Psycho Gundam is located at the head. Psycho Gundam can only be piloted by cyber new-type and it's assigned pilot is Four Murasame in Zeta Gundam anime. The pitiful Four Murasame was a member of Titans with complex personality who wanted very badly to recollect her memories. She was more like a laboratory guinea pig used to test Psycho Gundam. She's very gentle at times and her emotion would swing like split-personality. Sure is quite sad to see her died in the anime.