Question: Who created the character that William Arnold "Billy" Costello  voiced and appeared in the daily King Features comic strip?

Context articles: Dennis the Menace (U.S. comics)
Popeye
Sesame Street (comic strip)
William &quot;Billy&quot; Costello
My Cage
Popeye and Son
Slylock Fox &amp; Comics for Kids
Flash Gordon (film)
Todd the Dinosaur
Mary Worth

Dennis the Menace is a daily syndicated newspaper comic strip originally created, written, and illustrated by Hank Ketcham.
 It debuted on March 12, 1951, in 16 newspapers and was originally distributed by Post-Hall Syndicate.
 It is now written and drawn by Ketcham's former assistants, Marcus Hamilton (weekdays, since 1995), Ron Ferdinand (Sundays, since 1981), and son Scott Ketcham (since 2010), and distributed to at least 1,000 newspapers in 48 countries and in 19 languages by King Features Syndicate.
 The comic strip usually runs for a single panel on weekdays and a full strip on Sundays.
Popeye the Sailor is a cartoon fictional character created by Elzie Crisler Segar.
 The character first appeared in the daily King Features comic strip, Thimble Theatre, on January 17, 1929, and Popeye became the strip's title in later years; Popeye has also appeared in theatrical and television animated cartoons.
Sesame Street is a nationally syndicated comic strip inspired by "Sesame Street".
 Written and drawn by veteran Sesame animator Cliff Roberts, the earliest concept art was created in 1970, and by 1971, a promotional booklet was created as the comic entered the market, courtesy of King Features.
 The strip debuted on November 15, 1971, in more than 175 newspapers, and ran until 1975.
 The strip, which ran both daily and on Sundays, was conceptually similar to the series in its pedagogical goals, but, in the first two years of the strip, conspicuous by the absence of the Muppets.
William Arnold "Billy" Costello (February 2, 1898 – October 9, 1971), commonly known as "Red Pepper Sam", was an American live and voice actor, and the original voice of Popeye the Sailor in animated cartoons.
My Cage was an American daily comic strip by Melissa DeJesus and Ed Power and was distributed by King Features Syndicate.
 The strip debuted on May 6, 2007, while the final strip ran on October 31, 2010.
 "My Cage" was the first "manga-inspired" comic to be syndicated by King Features.
 Currently, the 2007-2010 strip is in re-runs on Universal Uclick's gocomics.
com.
Popeye and Son is an American animated comedy series based on the "Popeye" comic strip created E.C. Segar and published by King Features Syndicate.
 Jointly produced by Hanna-Barbera and King Features subsidiary King Features Entertainment, the series aired for one season of thirteen episodes on CBS.
 It is a follow-up to "The All New Popeye Hour".
 Maurice LaMarche portrayed the voice of Popeye in this series, succeeding Jack Mercer in that role.
 It is also the first set of Popeye cartoons that were produced since Mercer's death in 1984.
 Following its original run on CBS, this series reran on the USA Network in the 1989-90 season and on The Family Channel from September 1994 to December 1995.
 It can currently be seen for free on Amazon Video.
Slylock Fox & Comics for Kids is a daily comic strip created by Bob Weber Jr. and published by King Features Syndicate.
 Bob Weber Jr. is the son of Bob Weber Sr., creator of the comic strip "Moose & Molly".
 As the comic's name implies, the target audience is young children.
 According to the official website, "Slylock Fox & Comics For Kids" appears in nearly 400 newspapers with a combined readership of over 30 million.
Flash Gordon is a 1980 science fiction action film created in Technicolor and Todd-AO, based on the King Features comic strip of the same name created by Alex Raymond.
 The film was directed by Mike Hodges and produced by Dino De Laurentiis.
 It stars Sam J. Jones, Melody Anderson, Topol, Max von Sydow, Timothy Dalton, Brian Blessed and Ornella Muti.
 The movie was co-written by Michael Allin (of "Enter the Dragon" fame) and Lorenzo Semple Jr. (who had previously scripted De Laurentiis's remake of "King Kong").
 It intentionally uses a camp style similar to the 1960s TV series "Batman" (for which Semple had developed and written many episodes) in an attempt to appeal to fans of the original comics and serial films. Although a box office success in the United Kingdom, it performed poorly overseas.
 The film is notable for its soundtrack composed, performed and produced by the rock band Queen, with the orchestral sections by Howard Blake.
 The film has since gained a significant cult following.
Todd the Dinosaur written and drawn by Patrick Roberts, is an American gag-a-day comic strip about a 7 year old "Tyrannosaurus" attending elementary school.
 Being only second graders, his classmates accept Todd as they would anyone else.
 The strip first appeared in 2001 in "The Oklahoman" and is published by King Features Syndicate.
 It has also appeared in "Record-Journal", "Herald News" and "San Francisco Chronicle".
 It participated in the second Earth Day comic event of King Features.
 During one day, 37 of their creators used their comics to advance an environmental theme.
Mary Worth is a newspaper comic strip, which has had a seven-decade run since it began in 1938 under the title Mary Worth's Family—a name that was later changed in 1942 in recognition of the fact that the strip came to focus more and more on the title character Mary Worth and less on the members of her extended family.
 Distributed by King Features Syndicate, this pioneering soap opera-style strip had an influence on several realistically drawn continuity strips that followed.
 The strip, by Allen Saunders and Dale Connor, initially appeared under the pseudonym "Dale Allen".
 Ken Ernst succeeded Connor as artist in 1942, and the title was shortened.
 Harvey Comics published a comic-book spinoff, "Love Stories of Mary Worth", from 1949 to 1950.
 It is loosely associated with an older comic strip, Apple Mary: Mary Worth's Family, though its current syndicate denies any association no matter how loose.