6. Abra Kadabra

FUTURE MAGICIAN! God, this is why I love Flash villains.
Abra was a magician from the 64th century, where science was so amazing, stage magic was no longer impressive at all. So Abra was out of a job at children’s birthday parties or whatever. Losing gigs to those goshdarn future clowns. So Kadabra stole a time machine and went back in time to the 20th century to find a captive audience. And by captive I mean kidnapped. Because he was also a criminal.
Kadabra menaced the Flash quite a bit, even turned him into a puppet once. That’s a great cover and issue, by the way. All the Abra Kadabra ones are. Seriously, no old school Flash villain is the source of as many great silver age Flash stories as Abra Kadabra.
And he’s back now!!!!!!!!! Yeah, he popped up in the DC Rebirth Titans series (which is pretty good, by the way). Because he menaces Wally West just like the olden times! Good to have you back, Kadabra.
