The various, magical themes of the greatest villian (HERO) Sephiroth.
Final Fantasy VII's Seph is a hero among villians. He's the favorite, most popular, most amazing character ever created, and he is simply amazing. Nobody could ever create a character quite as complex or deep or thought provoking as the great legendary one.
Green eyes, SOLDIER rank, silver hair, great looks, deep emotions, complex motivations, a long sword, and much more are required for something as amazing as Sephiroth himself.