How are you getting along with your current 'Creature?'
I see a pretty reasonable setup already for many of the things you mention...do you find yourself hitting roadblocks with any of the current modules or workflows? Are you always saying, "I wish I had more xyz?" in the middle of a patch?
Perhaps I'd want to add a vc/sequential switch? Something simple like Doepfer's A-150/ A-151 can help create movement/variety.
Otherwise, it looks like you've got your noise/s&h/vca/voices/filters/delay/sampling/random/envelopes/looping mostly covered.
Maybe more lfos to help animate things? Batumi II or Quadrax really offer a lot of options in this department, Quadrax also a heavy-hitter on the envelope side of things. I haven't used the Ochd by divkid but that is a popular choice for lfos.
Maybe an attenuator/invertor/mixer like Happy Nerding 3x MIA?
Maybe more mixing in general, although I guess Maths can serve that function (as well as attenuverting) in a pinch if needed.
Best wishes!
“You must have chaos within you to give birth to a dancing star.”
― Friedrich Nietzsche