tips
#1: make all the actors for the ragdoll the same size (like if the head is size 3, the body is also size 3) unless necessary
#2: so it is smoother make the hinges (joints) fit perfectly (so you use a size 2 circle with a square hole with size 2, so you can't move the limb up and down inside of the joint)
#3: (optional) you can make the head have negative gravity so it floats, and feet have higher gravity so it stays on the ground, like stabilization
#4: minimize the amount of shapes in the collision so it is harder to mangle up the ragdoll (like if you use many shapes, you could shove the arm socket into a shared corner of one of the shapes)