Danny the Cougar Robot

A character from another one of my random worlds I make up in my head when I'm bored. He's actually an alien who rocketed to Earth in the back of a transport ship. When he landed, the world was recovering from a nuclear war that left most of the planet ravaged in an endless desert.
Most of the metal you see on him can be ejected if it's damaged, and makes him lighter. He can also be ridden in by a certain pilot.