Slender Sickness - Some people who come into contact with the Slender Man suffer from a strange illness.

Pyrokinesis - It is believed that Slender Man has control over fire, as in early stories, it'd usually set fire to any proof of its existence, either during or after it has stalked or killed a person.

Distortion - Any digital device near the Slender Man suffers from distortion.

Animals can see Slender Man no matter where he is, hence the bags of animal corpses in early tales of the Slender Man. It can be seen in pictures by anyone, but their will be some distortion in digital cameras.

Selective Visibility - The Slender Man has the ability to determine who can see him.

The tentacles are used for reaching, grabbing, overtaking obstacles and walking, similarly to a spider

Tentacles - Slender Man has the ability to sprout tentacle-like appendages from his back and shoulders.

It has also been known to mimic a child's laugh, usually to lure another child in.

Impersonation - Although not often shown, it is believed the Slender Man has the ability to mimic human speech and laughter.

For example, the cult in DarkHarvest00 were brainwashed, while the character Kate from Slender: The Arrival was turned into a proxy by Slender Man after it sent her insane. Although there are no examples of puppeteering as of yet, internet ARGs and games have examples of the other two. So far he has been able to brainwash a victim (Stockholm Syndrome), partial control over a victim (Proxies) and full control (Puppeteering).

Mind Control - Slender Man has the ability to control a person's mind to an unknown extent.

Also, he has been mistaken as a tree from a distance.

Camouflage - Slender Man is believed to take the form of a high ranking member of society to make humans believe he is, from a distance, human.

It is unknown if this is proper teleportation or rather another universe that it uses to move around.

Slender Walking - A common name given to Slender Man's ability to appear and disappear at will.

However, this has yet to be proven for obvious reasons. It is believed by some that Slender Man has a face which is covered by a thin membrane of skin. Slender Man typically is depicted in imagery and literature as between 6 and 15 feet tall, depending on the situation, and in video as around 6-7 feet tall. It has no hair, and generally has normal-looking bare hands. Slender Man generally appears as a tall man in a black or grey suit, red or black tie, and white shirt, with no eyes, mouth, or clearly defined facial features.

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