John Constantine is a fictional character.
An antihero , or antiheroine , is a protagonist who lacks conventional heroic qualities such as idealism , courage , or morality . Hellblazer . Its central character is the streetwise magician John Constantine , who was created by Alan Moore and Stephen R. Bissette , and first appeared as a supporting character in The Saga of the Swamp Thing # 37 ( June 1985 ) , during that creative team 's run on that title . John Constantine . The Hellblazer series was the longest-running and most successful title of DC 's Vertigo imprint . The Swamp Thing is a fictional character in the DC Universe .