Is there a better friend to foe tale in the comic book world than that of Sinestro? Born on a far-off planet, the character was an archaeologist specializing in lost civilizations before he had a Green Lantern ring bestowed upon him. As a member of the Green Lantern Corps, he was assigned to be the mentor for Hal Jordan or Earth. However, Sinestro's methods of policing were too harsh for the corps, and they banished him to the antimatter universe. Here he created a ring of power out of the Yellow Light of Fear, and the rest is history.
But let's step back here a second... Sinestro is just a Green Lantern gone bad. There's nothing special about his ring other than its power source (fear instead of willpower). It still does the same sort of things that a green ring allows a Green Lantern to do. Also, it gives him the slight advantage over his enemies, considering how vulnerable they are to the color yellow. Now that we mention it, doesn't Green Lantern technically have a doppelganger for every color of the color spectrum?
Reverse Flash is more of a title than it is a singular character. Five different men have donned the name as they took on the likes of Jay Garrick, Barry Allen, and Wally West across the decades. The villain has also had different villain monikers; Professor Zoom, Inertia, and the Rival are all lumped under the wide umbrella of "Reverse Flashes." The character is one of the Flash's greatest enemies, on top of being one of DC's fastest characters. Currently, three iterations of the character have appeared in the Arrowverse on the hit CW show The Flash.
They didn't even try to hide the fact that this guy is a direct copy of his hero. His name is "Reverse Flash" for crying out loud! He gets his powers from the "Negative" Speed Force. His costume is literally just the Flash's with the colors reversed! There's your standard copycat villains, and then there's the Reverse Flash.
What do you think of our list? Are we being too harsh on some of these guys? Any doppelganger villains that we've missed? Let us know in the comments below!