If you've got a problem with the occult, and no one else can help... go find Dr. Strange, Daimon Hellstrom or Dr. Thirteen. Pray you don't ever get desperate enough to need John Constantine. Because the scouse mage, supernatural conman, and devil-taunting hellblazer is not a man you should ever wish to turn to in a crisis. John Constantine is good at helping one person, and one person only: John Constantine. Just ask his friends or family - well, you could if they weren't all burning in hell, possessed by demons or getting their insides ripped out by serial killers. (Yeah, there is Chas. Somehow Chas manges to survive everything John throws at him. Lucky bastard... if you can call that lucky.) Count on one thing - if you're in trouble and John Constantine gets involved, things are going to get much worse before they get better.
Why John Constantine? The real question is: why has it taken us so long?