Slenderman´s Abilities

Abilities
Slender Man's original abilities included invisibility to select people, adult humans, or anyone without use of a camera, the ability to change height and body shape, the ability to shape its arms into tentacles, and the ability to sprout tentacle-like appendages from its back and shoulders to be used as additional arms or legs (or simply to instil fear into its prey). Many stories seem to indicate that it can control a person's mind, which became the basis for the Proxies in the video ARG, a trend that would later spread to Slenderblogs. Slender Man also had connections to children, with many of the original stories revolving around disappearing children or featured Slender Man being sighted in photos with children.


As more stories came forth, however, the use of tentacles and tentacle-like appendages became less common, and the invisibility was limited or eliminated depending on the storyteller.
EMH, TT, ML, and DH all contain some sort of video and/or audio distortion, indicating that Slender Man has some sort of effect on modern digital instruments. This does not appear in any of the original accounts- however these mostly make use of photographs and video of primarily lower-tech varieties. EMH Has applied this distortion to be the effect of Sigma Radiation, a radiation given off by Slender Man and The Rake. Sigma Radiation is also contagious, as it entered Evan's blood-stream when his arm is brutally maimed by The Rake

EMH and ML also make use of "Slender Walking", a term created to describe Slenderman's apparent teleportation, appearing, and disappearing at will. EMH independently indicates the use of selective invisibility to groups or individuals through head tilting, and also spacetime warping/teleportation between locations. Similar abilities were seen in early Slenderman accounts. EMH also hints at the affecting of mental health or control of it.
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Author Note: Although I have some things to say, Slenderman can be seen in some channels  in Youtube such as: MarbleHornets, EverymanHYBRID, DarkHarvest00, MLAndersen0, Tribe Twelve...
Beware though all you will see of Slenderman in there is not for those who get scared easily. From here on you are on your own,
Jane and Zane
The Deadly Twins.