otherwindow:

Paranormal entities like demons aren’t native to our reality, so I love monster designs where they look human but something’s clearly wrong: Jerky movements, fast twitching, floating off the floor, etc.

Concept: Demons who look just like humans but are clearly not:

• Visually distorted even when up close.
• Even if your vision is poor you can still see the demon far away even if everything else is blurred.
• Shadows from the wrong light source.
• Mimics your breathing and blinking.
• Voice can be heard clearly no matter where the demon is.
• Mouth not in sync with words. 
• Somehow breathing while speaking, or not breathing at all. 
• Features change every time you look away from them or blink. For example, a mole on the nose has moved to the forehead, or they’re suddenly taller/shorter than you. 
• Subtle sounds like scratching an itch or cloth being rustled by movement is much louder than it should be, or makes no noise at all. 
• Reflection/shadows are not matching. 
• When asking other people what the demon doing right now, all accounts are different. 
• Because demons aren’t from this world, anything they interact with becomes “wrong”. For example, doors that usually open from the outside now open from within, and ceilings being lower or much higher than physically possible.