Eobard Thawne (Reverse-Flash)
Oh, yes! You know why season 3 hasn’t been as good as the first two? Because we haven’t seen enough of the Reverse-Flash, the Scarlet Speedster’s greatest adversary. This needs to be remedied, and we have the perfect way to do so.
With Barry out of the picture, what motivation does Eobard Thawne have to stay a bad guy? Okay, he has plenty, but hear us out here for a second. Like Captain Cold found his conscience, so, too, could Reverse-Flash. Instead of screwing with timelines, he could dedicate himself to helping Team Flash keep Central City free from the evil doers of all the alternate universes.
Obviously, his babyface turn would only be temporary, because we all know that bad guys are bad to the core on TV shows. But at least this keeps us entertained until Barry returns and fights his nemesis again. To make things more fun, we could even have a member of Team Flash defect to Reverse-Flash’s side. Our vote’s for Cisco.