The Mimic - (Chapter 1) Monster 2

 About 

This monster is actually a moving Stone that can look exactly as the other Stone Figures around her. Theres not much about her, but we do know that the Villager tells us that his brother went to the "City", and never came back, and this means that someone probably killed him, but we are not actually sure about who.

The Mask/Face of this monster seems to be disappeared at the end of the Chapter 3, where you can find some Masks/Faces from some monsters.

 Media