I wonder if it would be possible to incorporate something like NaturalMotion’s Euphoria (was used in GTA IV and V, not sure about any others) into the BGE.
If I recall correctly, there’s direct access to bones via Python, so to a certain extent some of what’s presented is possible. There’s was a Zelda thread recently on here, where someone had programmed semi-procedural/procedural animations.
I don’t think we can rig things in that manner though : 1