Question: What is the nickname of the creator of the comic strip character "Pig-Pen"?

Context paragraphs:
Minnie the Minx: Minnie the Minx, whose real name is Hermione Makepeace, is a British comic strip and comic strip character published in the comic book magazine "The Beano".  Created and originally drawn by Leo Baxendale, she first appeared in issue 596, dated 19 December 1953, making her the third longest running Beano character, behind only Dennis the Menace and Roger the Dodger.

Bob Penuelas: Bob Penuelas is a comic strip illustrator and writer.  He was the creator of the comic strip character Wilbur Kookmeyer, which has appeared in Surfer Magazine since 1986.

Charles M. Schulz: Charles Monroe Schulz (November 26, 1922 – February 12, 2000), nicknamed Sparky, was an American cartoonist best known for the comic strip "Peanuts" (which featured the characters Charlie Brown and Snoopy, among others).  He is widely regarded as one of the most influential cartoonists of all time, cited as a major influence by many later cartoonists, including "Calvin and Hobbes" creator Bill Watterson.

Henry (comics): Henry is a comic strip created in 1932 by Carl Anderson.  The title character is a young bald boy who is mute (and sometimes drawn minus a mouth).  With the exception of a few early episodes, the comic strip character communicates only through pantomime, a situation which changed when Henry moved into comic books.

Pig-Pen: "Pig-Pen" is a character in the comic strip "Peanuts" by Charles M. Schulz.  He is a young boy who is, except on very rare occasions, very dirty.

Spirou (comics): Spirou (Walloon for "squirrel, mischievous") is a Belgian comic strip character and protagonist in the comic strip series "Spirou et Fantasio" and "Le Petit Spirou".  He also serves as the mascot of the Belgian comic strip magazine "Spirou".

Roy Race: Roy Race was a British comic strip character, a professional football player who appeared in the comic strip "Roy of the Rovers".  The strip first appeared in the boys' comic Tiger in 1954 and continued for 22 years before giving its name to a new weekly (and later monthly) comic magazine, published by IPC and Fleetway from 1976 until 1995, in which it was the main feature.

Tarkan Versus the Vikings: Tarkan Versus the Vikings (Turkish: "Tarkan Viking Kanı" ) is a 1971 Turkish action film, directed by Ertem Eğilmez based on a comic strip by Sezgin Burak, starring Kartal Tibet as fictional Hunnic warrior Tarkan, who vows revenge against Viking raiders after they ambush him and leave him for dead.  The film, which went on nationwide general release on  1, 1971 (1971--) , was the fifth in a series of seven films based on the comic strip character and was released in the USA in 2005 by Mondo Macabro on a double-bill DVD with "The Deathless Devil".

The Bullshitters: Roll Out The Gunbarrel: The Bullshitters: Roll Out The Gunbarrel was a spoof of "The Professionals", first broadcast in 1984 on Channel 4.  Although it was made by many people behind "The Comic Strip", it did not feature the Comic Strip logo and is not considered by some to be part of the series.  However, it "was" included in the Comic Strip DVD box set (2005), and its lead characters Bonehead and Foyle reappeared in a later Comic Strip episode, "Detectives on the Edge of a Nervous Breakdown".  It was also represented as an episode of the show on "30 Years of The Comic Strip".

The Yellow Kid: The Yellow Kid was the name of a lead American comic strip character that ran from 1895 to 1898 in Joseph Pulitzer's "New York World", and later William Randolph Hearst's "New York Journal".  Created and drawn by Richard F. Outcault in the comic strip Hogan's Alley (and later under other names as well), it was one of the first Sunday supplement comic strips in an American newspaper, although its graphical layout had already been thoroughly established in political and other, purely-for-entertainment cartoons.  Outcault's use of word balloons in the "Yellow Kid" influenced the basic appearance and use of balloons in subsequent newspaper comic strips and comic books.

Supporting paragraphs: Pig-Pen Charles M. Schulz
Answer: Sparky