Deadpool is a fictional character that appears in comic books published by Marvel Comics. Created by artist Rob Liefeld and writer Fabian Nicieza, Deadpool first appeared in The New Mutants #98 (Feb. 1991).
A disfigured and mentally unstable mercenary, Deadpool originally appeared as a villain in an issue of New Mutants, and later in issues of X-Force. The character has since starred in several ongoing series, and sharing titles with other characters such as Cable. The character is famous for his tendency to break the fourth wall and is frequently referred to by the moniker "Merc with a Mouth."