During the conceptual phase Mac did have drawings of the store merchants, they were robots with screens for faces. I swear it’s somewhere in the development sneak peak thread.
But ever since Frankie was added I’d hope for more unique models for all the store merchants, similar to the old concept art as it’s way more interesting and unique than what we have now.
EDIT:
Okay so the earliest thing I can find in the development thread is this model. Perhaps mac posted the concept art sometime in the discord and it was never actually uploaded somewhere. But I remember many variations of this robot drawn up.
Oh and this: