deadpool

I always forget (or just black out to spare myself the agony) what Wilson's most lethal weapon is... his mouth! He'll talk nonsense until you surrender or commit suicide.
--Domino

Deadpool is a mercenary and anti-hero appearing in comic books published by Marvel Comics. Created by artist Rob Liefeld and writer Fabian Nicieza, Deadpool (Wade Wilson) first appeared in The New Mutants #98 (Feb. 1991).

A disfigured and mentally unstable mercenary with the ability to quickly regenerate himself, 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 shares titles with other characters such as Cable. The character, known as the "Merc with a Mouth", is famous for his talkative nature and his tendency to "break the fourth wall", which is used by writers for humorous effect.

With his inclusion in Marvel vs. Capcom 3 his ability to break the fourth wall has been taken to a whole new level. The character would later achieve even greater success after his 2016 film of the same name, followed up by 2018's Deadpool 2.