Loophole, aka Deacon Dickson, is similar to my take on Stasis, in that he is an aging guy who seems like he is turning to villainy as a way to feel young and powerful (and, of course, “show them all”). But where I decided that Stasis is pathetic and kind of sympathetic, Loophole is a slimy asshole.
Probably having the most appearances of any of the crooks I am analyzing lately, Loophole invented a device that allows him to slip through solid matter. Using this for crimes, he would often bring along young women as his “sidekick” and if that doesn’t sound like the behaviour of a man trying desperately to deny his aging, I don’t know what does.
Instinctively, I feel like Loophole would hate being part of a team. He’s got something to prove. He uses henchmen. Unless he is the leader, he would be unhappy. With that in mind, I’d cast him not as a member of the supervillain team I’ve been building up, but as a rival.