NBC finally debuts "Constantine," its adaptation of the "Hellblazer" comics, tomorrow night in the United States. Matt Ryan takes on the role of John Constantine from the comics in an interpretation that's expected to hew closer to the source material than the Keanu Reeves-led 2005 film adaptation. For starters the look and accent are much more like the chain-smoking bisexual demon hunter from the comics, the personality is as well.