6. The Justice League Dark
Another DC team who focus more on supernatural threats are the Justice League Dark. Although some of their members are also a part of the Sentinels of Magic, the team consists of more superhero archetypes than the Sentinels and tends to deal with situations that are deemed unfit for the more well-known Justice League of America (ghosts, possessions, spell-casting - those kinds of thing). They are led by John Constantine - a character who has already been brought to the big screen when Keanu Reeves donned the long coat in 2005's Constantine (a film that I think was extremely underrated). With Constantine joined by popular characters such as Frankenstein's Monster, Swamp Thing and Zatanna, it would be awesome to see them come together in a movie.