When I write something that takes another person's creation, I tend to take my liberties with it if I'm allowed permission. In Jordan Eats Normally Now, readers are wondering why my Empty City isn't "behaving" like The Empty City "should." This is also because of the liberties I take. I like to make sure everyone's guessing, and if not even the creators are sure how their creations work, then you have some proper horror.
Case in point: Mister Troy Wagner took some liberties with the slender man when making Marble Hornets Part 1, and now his artistic vision of the creature has wound up becoming the norm for most slenderblogs.