I never considered how cool Lee is as a villain until recently. In terms of threat level, she makes her sisters entirely redundant. She's the strongest, smartest, and most driven of the three, but the benefit of the other two, which only makes Lee herself scarier, is that she has a couple of lackeys who are pretty threatening too and totally devoted to her and each other, and look to her for guidance. Lee is why the Kankers are so threatening. She's not just Best Kanker, she's Quintessential Kanker.