[Lawtan]

Slender Man - Internet Urban Legend of a pedo-suit wearing-tentacle-no face-interference monster

Cthulhu - One of Lovecraft's "Old Gods" - an alien that will drive you insane by it mere knowledge...and devour everything.

Nagash - Founder of Necromancy in another game mythos...goal is to rule over a world of undead, where nothing is done without his control.

Zalgo - Internet Urban Legend said to be the cause of all comic/childhood show corruption. Looks like the Greek Typhon (many eyes, heads, limbs etc)