Character Body Part Dismemberment

You could create modified versions of your characters which include severed limbs and torsos with limbs missing. This gets you the ability to make unique separation points, like jagged edges or jiggly bits; the problem is, creating all the different torso meshes takes up a lot of space (for me anyway. simple characters, this might not be a problem).

The method I currently use -

Duplicate your ragdoll. Scale the torso bones to zero on one ragdoll, and scale the limb's bones to zero on the other. Can be useful if the sever points are obscured (e.g. by particles), since where the bone is severed looks very fake. Then create small "cap" objects that fit to each sever point and obscure the fake-looking zero-scaled section.

It's a little tedious to code, but it's worked well for me so far.