The first time I saw Aizen on Bleach, I automatically thought, "Clark Kent!" At first I thought that Tite Kubo and team just based his design upon Clark Kent's appearance, glasses and all. But like Clark Kent, he was mild-mannered, soft-spoken, and appeared to really care about his underlings.
Later when he was revealed to be a villain, I saw the "Superman" traits, minus Supes' morality. He could move faster than a speeding Yoruichi, more powerful than twice the reiatsu of an elite Shinigami captain, and able to stop bankais with a single finger. Even when he crushes his glasses, Aizen still had Superman's bangs! I can't stop calling him Bad Superman, or Shinigami Superman.