A little idea in the back of my head for some time: In a near future society with widespread transplantation technology (one might call that cyberpunk :D) clinical studies have shown, that vat grown organs and other replacement parts achieve a higher acceptance rate with the target body, if they are not out-of-the-tank blank slates, but have been “used” before. This seems to go deeper than i.e. just contraction stimulation for muscles etc. Organs that have been subjected to the correct gravity conditions, the rhythm of human locomotion or the exposure to sunlight, sound and other stimuli are adopted better in the target body.
Therefore multiple big cloning corporations developed robotic chassis that could walk their transplants around in controlled environments to make them a superior product.
Here is how such a robot could look like, in a bare chassis version, with a possible load-out of transplants, in several color variations and some rough early sketches.