It remains unclear just how dangerous Jack Duquesne will turn out to be, but he does share his name with a rather important figure from Hawkeye's past. In the comics, Jack is a character known as the Swordsman, who takes Hawkeye under his wing during their time performing in circuses and carnivals. Just like on the show, the character is a master swordsman, but he also has a gambling addiction which leads to him becoming a master thief. While there doesn't appear to be any connection between Clint and Jack on the show, Jack's redemption arc in the comics suggests he might not be quite as evil as Kate thinks on the show, even if he does bend the law.