A way to make a blob softbody is to make bunch rigidbodies in a ring formation and use DampedSpringJoints to join them together. If it loses it's shape too easily, try adding a central rigidbody with attachments to every other point.
I tried making one from 8 + 1 points by hand, and it works reasonably well, even if coarsely. It was in a following formation:
But I recommend making a script which creates all needed rigidbodies and springs via parameters, otherwise it'll get quickly out of hand.