Hellblazer
John Constantine isn’t your typical hero. The wisecracking occult detective has his fair share of character flaws, but is ultimately looking to do something good. A detective story is a great setup for an episodic series (and probably why A Wolf Among Us starred Bigby Wolf) and Telltale could either feature a young version of the character or an older version depending on what type of story they wanted to tell.
It’s also worth noting that John Constantine is already known to mainstream audiences thanks to 2005’s Constantine film starring Keanu Reeves, and a 2014 TV series featuring Matt Ryan as the British detective. Ryan has also reprised his role on CW’s Arrow, so it’s not like the character has been away from viewer’s televisions for long.