This is a preliminary character design. I've had a sort of an amorphous baddie in my mine for a while. I wanted him to be pretty strong and big, so you might draw some parallels to Clayface (Batman) or Plasmus (Teen Titans), though I drew him without reference to either. I was trying to show that this guy, though large, can move really fast, so fast that the outer layer of slime on him is pushed backwards rather than flowing downwards. I was torn between whether to make this guy more solid or to make him gooier. In the end I never really decided, but I went with the idea that even though all of his muscles are not solid and flow and stuff, they somehow keep in the right positions.
Physical Description of Movement: When he moves, he puts down the forward foot really hard; he can't help it, he's heavy. Not only does this splatter a heck of a lot around (hence the large splatter), it also makes the ground slippery, allowing him to slide forward (hence waves in front of his forward foot). The forward foot eventually comes to halt, causing some of the slime to roll forward in beads (thing of liquid spilling from a cup); this phenomenon can be seen from the back foot. When he pulls his back leg up, the slime stretches as he pulls most of it back off the ground. It's kind of a weird effect, but I hope you can see what I'm talking about. The slime also interacts with itself like water droplets on a windshield; this is somewhat conveyed in the splattering between the two steps.