In more recent horror works, dark things from beyond the fringes of mankind's consciousness are prone to showing up in forms that for all intents and purposes look like good ol' Homo sapiens (and in many cases, actually were humans until they went beyond the pale). They may be improbably pretty, albeit prone to seeming a bit off, perhaps even having a Red Right Hand. However, they may also look like a human form made twisted and horribly wrong, as good old Slendy shows us in the page picture. Alternately, expect fetuses. May be A Form You Are Comfortable With. Compare Bishounen Line, where the monster's most powerful form is humanoid, and Living Bodysuit, when a human body is possessed by the Eldritch Abomination.