Slender isn't scary, but the Slenderman is. It stalks children and can only be seen after the fact, in pictures and film. It's height is anywhere between seven and THIRTY feet tall, with branch-like secondary limbs (not arms or tentacles, but THINGS with ill-defined purpose) and a featureless ''face''. It's like a nightmare saw an over-exposed wedding photo and tried to copy it. It's scary because there are so few constants about it, and I think the game Slender kind of ruined the original idea of Slenderman by limiting it.