I suspect that Marble Hornets, the creator of the ongoing slender man-themed YouTube series, draws inspiration from Grant Morrison’s comic book series The Invisibles.
Here is a frame capture from Marble Hornets’ most recent upload, Entry ######:

Here’s a capture from Marble Hornets’ Entry #23:

This is another capture, this time from what is likely to be Marble Hornets’ other account, totheark, in the video Warning:

By now you’ve probably gotten the idea.
This is the cover from The Invisibles, Volume 6: Kissing Mister Quimper:

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