9. Black Flash

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Along with Reverse-Flash (more on him a little later), The Black Flash would serve as an interesting parallel to Barry Allen in the CW series. As you may already know,┬áhe essentially fulfills the same role as “Death” for those who possess super-speed in the DC Universe, returning them to the source of their powers: the Speed Force. While that’s really about as far as his role in the comic books goes, there’s room for a few elements of The Black Flash to be tweaked in a live-action adaptation. He could perhaps haunt Barry throughout the season, resulting in a battle between the two or could be used as some sort of shadowy nemesis with a further developed reason for wanting to take anyone connected to the Speed Force. Arrow has done a great job of fleshing out and reimagining characters like this, so there’s no doubt that the same could be done in The Flash!