Nightmare Fuel / The Slender Man Mythos

As perhaps the most infamous Creepypasta character, it's no surprise that the Slender Man has inspired his fair share of nightmares.

Please note that Dark Harvest, Everyman HYBRID, Marble Hornets and Tribe Twelve already have pages.

http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/TheSlenderManMythos