There are no specific demons that are similar to Slenderman, though Slenderman has many ties to other tales and folklore. Slenderman has many similarities to the likes of child stealing Fairy Tales, as well as more modern myths, like The Gentlemen and the Kinderstodt from Buffy the Vampire Slayer and Jack Skellington from Nightmare before Christmas, for just three examples.
From the realms of conspiracy theories, the Men in Black are also a good example of a Slenderman analogy, the faceless suits that come in and make you disappear without a trace.
Hope that helps.
Slender man
Slender
...Seriously? Cuz he's Slender, meaning skinny, thin, etc.
slender man is real
slender man but in girl-form
the slender man
Slender Man.
skinny = dünn, mager.
When you happen to see Slender Man, simply picture him as calamari or as somebody who is virtually senseless to overcome your fear. Remember, too, that Slender Man is not real.
Demon as Bad Man - Demon Kogure album - was created in 1990.
The concept of the Slender Man, a fictional supernatural character, was popularized on the internet through forums like Something Awful and Creepypasta in the early 2010s. People claim to have seen him in various stories, videos, and games, but there is no evidence to suggest he actually exists in reality.
No, slender man is.