Ragdoll Player

Is it possible to make a Ragdoll Player like you have the camera following the ragdoll and when you press one of the WASD it moves in the direction but like in a retarded way as in it rolls over and flips around but it goes in that direction. Because im making a powerful physics sandbox game and im having allot of trouble making the model of the main character which is meant to be a cube-like creature like the ones in Sumotori Dreams. But like I said im having trouble with it because I don't know what to program to make it on and what format to export it as also how to do I turn into a Ragdoll.