Ulquiorra Cifer- one of Aizen's strongest, most trusted allies. He was an embodiment of darkness, cold, dispassionate, callous, but despite his power was not particularly violent and did not result to brutality unless provoked, or ordered by his master, Aizen. He was known as a cruel villain, but seemed to be aloof, and lukewarm. Why was this? Why, even if he was feared and strong, why did he exhibit odd bouts of nihilism, and seemed to have a habit of killing his victims by sticking his hands into their hearts, as if it had a purpose? Even being a villain, and one that only follows orders, he was perceptive, analytical; but he doesn't understand human feelings. And yet, when he found he was to be killed by Ichigo, the hero, unlike his fellow comrades, he didn't curse, nor was he bitter. He simply...accepted it. Why was a major villain so empty? Why didn't he delight in inflicting pain like his comrades? This was simply because of his past. His past, which he couldn't remember, even in his last moments of existence. It was his past that caused him to become empty. And so Death gave him a second chance.