Question: Stuart Clarke and David Lieberman were fictional characters showcased in which comics universe?

Context paragraphs:
Microchip (comics): David Linus "Microchip" Lieberman (often known as Micro) is a fictional character appearing in American comic books published by Marvel Comics.  He was an ally of The Punisher for many years and assisted the Punisher by building weapons, supplying technology and providing friendship.  In more recent publications, Microchip gradually evolved from the Punisher's friend to a bitter villain.

Rampage (Marvel Comics): Stuart Clarke is a comic book character in the Marvel Comics universe, an ex-supervillain who first fought as Rampage against the short-lived Champions team.  He is an ally of the Punisher, replacing Microchip.

Newsboy Legion: The Newsboy Legion are fictional characters, a kid gang in the DC Comics Universe.  Created by Joe Simon and Jack Kirby, they appeared in their own self-titled feature which ran from "Star-Spangled Comics" #7 (April 1942) to "Star-Spangled Comics" #64 (January 1947).

David S. Clarke: David Stuart Clarke AO (3 January 1942 – 8 April 2011) was an Australian businessman.  He attended Knox Grammar School on Sydney's North Shore, the University of Sydney (BEc), and Harvard Business School (MBA).  Clarke was Executive Chairman of Macquarie Bank from its formation in 1985 until March 2007, when he ceased executive duties.  In 2007, he was appointed president of Winemakers' Federation of Australia.  Clarke also owned several vineyards in the Hunter Region of New South Wales and was the chairman of Australian Vintage Limited.

Legion of Substitute Heroes: The Legion of Substitute Heroes is a group of fictional characters in the future of the DC Comics universe.  The "Subs", as they are often called, are a group of rejected applicants to the Legion of Super-Heroes who band together, hoping to prove to the Legion that their powers are not as useless as the Legionnaires claim.  They first appeared in "Adventure Comics" #306 (March 1963) and were created by Edmond Hamilton and John Forte.  They were depicted as reasonably effective superheroes until Keith Giffen, during his tenure as "Legion" writer, began depicting the team as something of a joke.  The Subs regain some respect when founding member Polar Boy joins the main Legion and a new Legion of Substitute Heroes is formed.

David Lieberman Artists' Representatives: David Lieberman/Artists’ Representatives is a performing arts management agency located in Newport Beach, California, United States.  DLAR was founded in 1985 to support artistic expression in the creation of live performance experiences.  DLAR began with a single artist and over the years has grown to manage 8-10 internationally known artists touring worldwide.  In addition to its tour management efforts, David Lieberman/Artists’ Representatives focuses on the development and production of its artists’ works.

Justice League of Earth: Justice League of Earth are fictional characters, a supervillain team of the 31st Century in the DC Comics universe.  They were created by Geoff Johns and Gary Frank and first appeared in "Action Comics" #859 (January, 2008) as enemies of the Legion of Super-Heroes.

Chemical King: Chemical King is the name of two fictional characters in the DC Comics universe.  The first was Mr. Lambert, who was murdered under the direction of Alfred Stryker in "The Case of the Chemical Syndicate," the feature story of "Detective Comics" #27.  The second character named Chemical King was a member of the Legion of Super-Heroes in the 30th century.

Un-Men: The Un-Men are a group of fictional characters in the DC/Vertigo Comics universe.  Created by the writer/artist team of Len Wein and Berni Wrightson, the Un-Men made their first appearance in 1972, in the first and second issues of the original" Swamp Thing" comic book series.  The characters made subsequent appearances in later issues of "Swamp Thing" and its successor series, "Saga of the Swamp Thing," and in the 1994 five-issue Vertigo miniseries, "American Freak: A Tale of the Un-Men."  In August 2007, Vertigo (DC's "mature readers line") launched "The Un-Men," a monthly comic book series chronicling the further exploits of these characters.  Thirteen issues of that title were published.

Fatal Five: The Fatal Five are fictional characters, a supervillain team of the 30th century in the DC Comics universe.  They were created by Jim Shooter and first appeared in "Adventure Comics" #352 (1967) as enemies of the Legion of Super-Heroes.

Supporting paragraphs: Rampage (Marvel Comics) Microchip (comics)
Answer: Marvel