A good supervillain preys on his enemy's weakness. Sometimes they attack a hero's friends and family. Other times they use an elaborates series of deathtraps and trials designed to break the hero's spirit. But I think you'll agree that Mr. Midnight for reduces his enemies to a curled up wreck in a fashion that's all his own.
From the Return of Captain Invincible.
For some reason I can't exactly put my finger on, I think Mr. Midnight would be a great Iron Man villain.