John Constantine is a DC comics character.
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 .