Straw demon

RPG idea

If you ever find yourself making up a guy in your head to get mad at, that's the avatar of a memetic monster protruding into your reality.

The first time it's invoked, it's just a mess of straw in the rough shape of a figure. But every time you imagine someone who's in the wrong and have a completely fabricated argument with them, the demon takes on a more human form. Eventually, when it's become a perfect facsimile of you, it reaches through the next mirror you see and tries to drag you back into its realm.