Question: The Slender Man (also known as Slenderman) is a fictional supernatural character that originated as a creepypasta Internet meme, an activity, concept, catchphrase or piece of media which spreads, often as mimicry or for humorous purposes, from person to person via the Internet, created by which Something Awful forums user, also known as "Victor Surge"?

Context paragraphs:
Slender Man stabbing: The Slender Man stabbing occurred on Saturday, May 31, 2014, in the city of Waukesha in Waukesha County, Wisconsin, when two 12-year-old girls allegedly lured another girl of the same age into the woods and stabbed her 19 times, purportedly to impress the fictional character Slender Man.  After being stabbed, the victim crawled to a road and lay on a sidewalk where a cyclist found her and called 9-1-1.  She was rushed to a hospital, at which point she was "one millimeter away from certain death," according to a criminal complaint.  The victim recovered after being hospitalized for six days.

Internet meme: An Internet meme ( ) is an activity, concept, catchphrase or piece of media which spreads, often as mimicry or for humorous purposes, from person to person via the Internet.  An Internet meme may also take the form of an image (typically an image macro), hyperlink, video, website, or hashtag.  It may be just a word or phrase, sometimes including an intentional misspelling.  These small movements tend to spread from person to person via social networks, blogs, direct email, or news sources.  They may relate to various existing Internet cultures or subcultures, often created or spread on various websites, or by Usenet boards and other such early-internet communications facilities.  Fads and sensations tend to grow rapidly on the Internet, because the instant communication facilitates word-of-mouth transmission.  Some examples include posting a photo of people lying down in public places (called "planking") and uploading a short video of people dancing to the Harlem Shake.

Slender: The Arrival: Slender: The Arrival is a survival horror video game developed by Blue Isle Studios as a sequel to Parsec Productions' "", with Chapter 6 being a remake of the aforementioned game.  It was released on Microsoft Windows and OS X on March 26, 2013.  The game was released on PlayStation 4 on March 24, 2015 in North America and March 25, 2015 in Europe and Xbox One on March 25, 2015 worldwide.  Like its predecessor, the game is based on the Something Awful forums' creation, the Slender Man.

Avatar (computing): In computing, an avatar is the graphical representation of the user or the user's alter ego or character.  An icon or figure representing a particular person in a video game, Internet forum, etc.  It may take either a three-dimensional form, as in games or virtual worlds, or a two-dimensional form as an icon in Internet forums and other online communities.  Avatar images have also been referred to as "picons" (personal icons) in the past, though the usage of this term is uncommon now.  It can also refer to a text construct found on early systems such as MUDs.  The term "avatar" can also refer to the personality connected with the screen name, or handle, of an Internet user.  Common avatars may be Internet memes.

Hinomoto Oniko: Hinomoto Oniko (日本 鬼子 ) is a Japanese moe character created in 2010 which originated from the Breaking News (VIP) Board on 2channel, and has since become an internet meme within various forums and imageboards in Japan.  The character is a moe anthropomorphism of the phrase "日本鬼子", a commonly used Chinese ethnic slur against persons of Japanese descent.

Marble Hornets: Marble Hornets (abbreviated "MH") is a YouTube web series inspired by the Slender Man online mythos.  The first episode was posted on YouTube on June 20, 2009, following a post that its creator, Troy Wagner, created on Something Awful the previous day.

Something Awful: Something Awful, often abbreviated to SA, is a comedy website housing a variety of content, including blog entries, forums, feature articles, digitally edited pictures, and humorous media reviews.  It was created by Richard "Lowtax" Kyanka in 1999 as a largely personal website, but as it grew, so did its contributors and content.  Since then, the website has helped to perpetuate various Internet phenomena, and it has been cited as an influence on Internet culture.

Slender Man: The Slender Man (also known as Slenderman) is a fictional supernatural character that originated as a creepypasta Internet meme created by Something Awful forums user Eric Knudsen (also known as "Victor Surge") in 2009.  It is depicted as a thin, unnaturally tall man with a featureless head and face, wearing a black suit.

Slender: The Eight Pages: Slender: The Eight Pages is a freeware indie-developed first-person survival horror video game released in June 2012 as a beta for Microsoft Windows and OS X, utilizing the Unity engine.  Developed by Mark J. Hadley, the game is based on the quasi-folklore meme figure known as the Slender Man, who is depicted as a tall man wearing all black with a white face with no facial features.  The character is known for the ominous abduction of countless children in dark mysterious settings, such as deep forests and abandoned buildings.

Paffendorf: Paffendorf is a German dance project.  The group consists of Ramon Zenker, also producer of Fragma, Gottfried Engels and Nicolas Valli.  The project is represented by the Cologne DJ Christian Schmitz, active on Tiger Records.  Paffendorf is best known for their year 2000 hit, "Where Are You", although they have had various successful hits across Europe, their best known in the UK being "Be Cool," which peaked at number 7 in the UK Singles Chart in June, 2002.  Their song, "Under My Skin", had become an Internet meme, featuring Momo, a character from the anime series "Sumomomo Momomo" repetitively imitating a train engine with her hands and jumping up and down.  The song had been sped up to sound similar and rival to a more popular Internet meme, Caramelldansen.

Supporting paragraphs: Slender Man Internet meme
Answer: Eric Knudsen