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John Constantine created by Alan Moore, Steve Bissette, and John Totleben in The Saga of Swamp Thing #37 (June 1985)
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Originally designed by the artists to look like Sting, since they were fans of the Police
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Started off as a DC character, but shifted to Vertigo in 1993, where he essentially stayed for over 20 years until the New 52 combined the DC and Vertigo universes
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In the Vertigo universe, he ages in real time, unlike most comic book characters
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Born as a sole surviving twin – he inadvertently strangled his twin in the womb with his own umbilical cord – the birth also killed his mother, and his father resented him for her death
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Discovered he is the latest in a long family line of mages known as Laughing Magicians
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Ran away from home after messing up a curse on his father that left him frail
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Moved to London in 1969, got involved with the occult, and started a punk rock band called Mucous Membrane
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Also in a relationship with Zatanna Zatara, although it was revealed that he was bisexual
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His first act of heroism - in an attempt to save a young girl, he summoned a demon, but did so incorrectly, and it took the girl to hell – the demon, Negral, became one of his recurring antagonists
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Later met Swamp Thing, and helped teach him to become more powerful – one of John's longest friends
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A chain smoker, he contracted lung cancer – tricked one demon into drinking holy water, then sold his soul to another demon – rather than fight over it, the demons agree to cure him of his cancer
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Later blackmails God to keep his soul out of Hell, because if he goes to Hell he will take over, release the demons and not care about what happens
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Tries and fails to save his sister's soul from Hell – demons get one over on him
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New 52 – some small changes to backstory, but personality remains essentially the same
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Gets transported to Earth-2, where he cooperates with that world's version of himself until it's revealed that one of them has to die in order to save Earth-2 – he kills the native Earth-2 version, but tricks Darkseid and manages to save a large number of survivors