Slender Man

Origin: unknown

Advantages
"Slendersickness": can give people amnesia, trauma, the cold, cause disortions in cameras and videos

Natural Abilities: can stretch out his arms and has a few tentacles on his back that can also stretch. Plus he has the ability to teleport

Disadvantages (Weaknesses)
Radio Waves: as shown in the game "Slender: the Arrival", Slender is stopped if you get into a radio tower