Yarnchu
Yarn is comfy and easy to wear
Zero Two cries blood and tries to throw his organs at you, and he looks like a creepy angel cyclops thing.
The really disturbing thing?
This is a boss from a Kirby game.
Zero Two never threw his organs at you and only ever cries blood in artwork not during the actual battle. Still, if you search for the art it is rather creepy that it came from a Kirby game. However, I find Zero to be more disturbing than his second form.
Kirby's Dreamland 3 is an insanely adorable game, with the soft, scribbly sprites looking like a child's drawing. Then we see Zero, who doesn't really match Zero 2's creepiness in the looks department, but does things such as shoot blood from his eye at you as an attack, and even TEARS HIS FREAKING EYEBALL OUT OF HIS BODY IN A LAST DITCH EFFORT TO KILL YOU. And yes, this is a Kirby game.
Although I only find them really disturbing because of the Kirby game fact.
And Butterfree, Slenderman is like, I dunno. It's hard to explain. He SHOULDN'T be scary, but he seems to be scary anyways. *shrugs*