Shadow Freddy is Nightmare. He is the shadow of Nightmare Fredbear. He can become a physical entity instead of being just a shadow by feeding off of people's fears and pain. He can shapeshift easily into the forms of the other Freddy Fazbear animatronics such as Withered Freddy,Withered Golden Freddy,Toy Freddy and Freddy Gen. 3. With this ability,he can easily trick you into believing he's something else.