Send any feedback on anything that seems like slenderman was there, for example, in Yu-Gi-Oh, the Illousionist faceless Mage seems to have a resemblance to slenderman, hypnotic, no face, etc. it is also used to Pegasus, a supposed pedophile who uses the Millenium eye, the millenium items may also represent something, maybe the appearance of being seen everywhere but not being anything to noticable.