Ability: unknown
Victims: Anyone of Slendermans choice, people who bullied him in the past
Weapons: Hatchets
Killing method: A hatchet in chest, shoulder, head, or stomach
Quote/ symbol: most likely operator symbol
Most seen: in civilized areas, woods, forests, alleyways. Also known to break in houses.
Defence: Lock your entire house, don't bully retarded people, get security cameras or watch dog, never leave your house or room at night, stay away from alleyway, forests, or shortcuts.
Weakness: Abused past