He's like the rougher, trenchcoat-wearing version of Dr. Strange — a mystic badass who combines the "noir detective" archetype (complete with trenchcoat) with the "tough magician" archetype. He's endlessly cynical, snarky and not somebody you want to screw around with. He's capable of manipulating anyone, even Swamp Thing and some of the DCU's biggest heroes, when the stakes are high enough. He even smokes in the Batmobile.
Unlike most comic book magicians, Constantine rarely uses magical spells, unless he has to, especially in combat. Constantine faces most of his challenges relying primarily on his cunning, quick-thinking during fights, vast knowledge of the occult, manipulation of opponents and allies, and an extensive list of contacts. These skills are often more useful than his magical ones. He is known to have deceived many of the most powerful beings in the universe, such as The First of the Fallen and The Presence. In the DC universe, John managed to recruit Batman and Superman through his own manipulation. He is considered by many as being the world's greatest con man. Constantine is also one of a few people knowing all the routes to Heaven, Hell, and the afterlife, which he uses to escape and teleport without the danger of being chased by enemies. In the graphic novel Pandemonium, he once allowed himself to be killed, but later resurrects himself by exiting the afterlife.
As a sorcerer, Constantine is armed with the knowledge of many magical spells, rituals, and curses, such as evocation, necromancy, illusions, invisibility,and can even use magic to time travel. He also has a wide range of protection magic such as sigils and magic circles that can protect him from both physical and supernatural attacks.
But John's most signature ability is synchronicity wave travelling, which is an instinctual supernatural ability for Constantine to make his own luck. This has led John to uncanny luck at games of chance, the ability to avoid and escape harm, meet the right kind of ally to help prevent or stop an apocalyptic event from happening, and reshape the battle he's fighting to his own accord.Constantine is also highly resistant to many psychic attacks such as telepathy, possessions, and mind control. He can even use magic to block off omnipresence, seen where he once used sigils to hide himself from the First of the Fallen. By the New 52, other magical powers such as mild teleportation, counter spells, electrokineses, telekinesis, and immobilisation have been added. He can also use magic to reflect damages done to him unto his enemies.