I think if they are setting this in America then John getting out of Ravenscar mental hospital after the Newcastle incident would be the perfect time to have him come to America.
I hope they bring up Newcastle in the first season like they did in the early Hellblazer comics. You hear about Newcastle and know it was something really bad that happened to John Constantine and then you see it are like holy s*** now I know why he was so uncomfortable when it was mentioned by anyone.
Anyone think we'll get Swamp Thing guest starring or in a recurring role? Or Zatanna? Who are Constantine's recurring characters? I've read a handful of Hellblazer comics but it's really only him from what I remember. TV shows need recurring characters. I don't want a bunch of nobody cops and crap. Will he have a sidekick like that idiot from the movie?
The good thing about Constantine is he has had hundreds of supporting characters thought out his comic runs.
The majority of Constantine's supporting ended up dead. It is sort of John's thing that if you get involved in his crazy life you end up dead or something terrible happens to you.
Another thing is if John Constantine helps you then you owe him a favour which is something you never want to do. John often uses these favours as leverage to carry out something not good.
Some of John's major supporting characters are
Emma- John Constantine's ex-girlfriend, an American artist from Brooklyn (most likely a supporting character.
Chas - John's Cab driving best friend.
The Newcastle Crew - John's magic posse
Angie Spatchcock - John's magic using female sidekick
Map - A London tube maintenance worker, who also happens to be a powerful Magician who John occasional calls on for help.
Watford - A detective in London's robbery squad who is under John's thumb.
Gemma Master - John's niece who idolizes him
Kit Ryan - one of the loves of John's life.