Few villains in the Arrow-verse have undergone the transformation that Captain Cold has on The Flash.
He exited a hero and occasional ally to The Flash, which is not typical of the Captain Cold from comics lore.
As someone who loved Wentworth Miller’s run before he left in pursuit of other projects, I’d love to see him or someone else reenter the Arrow-verse to play a more traditionally evil Captain Cold.
The character was frequently seen as one of the hero’s greatest rivals, but on The Flash and Legends of Tomorrow became a bit of anti-hero.