Been messing around with sculpting a Dark Souls/Bloodborne style creature in Zbrush. I was mostly inspired by the mimic creatures, but I think this guy wouldn’t hide in a box. He’d probably be down a ‘far-too-small-to-hold-an-enemy’ alleyway, mush out like a roach or slug, and then start shambling after you far too quickly for any kind of comfort.
Gonna need to add teeth next. A mouth that covers that much surface requires teeth.