An auto rigger to generate :
bendy, stretchable limb.
SDK presets of foot and hand control.
Space Switch.
IK/FK Switch.
Might consider creating an interface for it or developing it into a full-body rigger if needed.
Model: https://sketchfab.com/3d-models/katanami-shadow-preview-1-178ec3f7b3e143128d9b7de84161c4bf
Music: https://www.bensound.com