One of my Grembles managed to anthropomorphize and boy did she turn out cute!

Grembles are a spirit critter, they're a cross between a gremlin, a goblin, and a domovoi. These little pests enter into your home in the night and eat any food you may have left out. They'll often then move to the cellar and begin eating up your food stores. They're hard to catch because they can go invisible at will and naturally can sense danger.

With good intentions you can see them and if you find an egg you can even raise yourself a pet Gremble. They're good luck, if not mischievous, and make for highly loyal and protective companions. If you're truly lucky and love them enough, they might morph into a more humanoid form similar to the one you see here.