John Constantine is a fictional character.
An antihero , or antiheroine , is a protagonist who lacks conventional heroic qualities such as idealism , courage , or morality . John Constantine . He serves as the lead character of the comic books Hellblazer ( 1988 -- 2013 ) , Constantine ( 2013 -- 15 ) , Constantine : The Hellblazer ( 2015 -- 16 ) , and The Hellblazer ( 2016 -- ) . A protagonist is the main character in any story , such as a literary work or drama . The Swamp Thing is a fictional character in the DC Universe .