1. Adrian Toomes and Blackie Drago were the first and second Vultures in Spiderman.
2. Abel Tarrant was the Tattooed Man, a villain in the Green Lantern series.
3. Leonard Snart was Captain Cold, a major member of the Flash's Rogue's Gallery.
4. Zebediah Killgrave was the Purple Man, who battled Daredevil and had the interesting power of convincing people of anything he wanted them to believe. He should have been a great salesman.
5. Flint Marko became the Sandman, a major character in the Marvel Universe and a charter member of the Frightful Four.
Michael Rebain got 3,4 and 5, while Mark Waldfogle and Mike P. were able to name all the villains.