This is the Demon rig that I created for the Angel vs. Demon cinematic project. Above is a short clip showing some of the demon animations in the final cinematic.
This is the final rig. I added IK/FK switches to all the limbs, and extra bones for muscle deformation in the hind legs. I've also added extra bones for some jiggle physics!
Full length cinematic (I made the Angel Rig, Demon Rig, and the Cherry blossom/fire VFX).
Some additional perspectives of the demon rig showing the range of motion available.
A prototype ROM created with the proxy version of the rig.