6) The Crimson Avenger
First featuring in Detective Comics #20, The Crimson Avenger has the honour of being DC’s first ever masked hero. In truth, he was heavily inspired by the likes of The Shadow and The Green Hornet – with a snappy colour-coordinated dress sense and an Asian sidekick (the Kato-like Wing).
It would be great to see this important character in DC’s history get his chance in the limelight. In a similar way to what Marvel did with Captain America: The First Avenger, a Crimson Avenger movie could be a part of the DCEU and showcase the original costumed hero in that universe.
Alternatively, they could do a film of his early superhero team The Seven Soldiers of Victory, which also features western-themed hero The Vigilante, medieval immortal Shining Knight and none other than Green Arrow (who obviously needs to get a solo movie soon, as well).