SOSUKE AIZEN SPOILER!
SA
Captain of Squad 5. Calm, soft-spoken, the kind of person every junior officer in Soul Society describes as approachable and kind. The betrayal that closes the Soul Society arc is one of the great villain reveals in shonen anime, not because it comes from nowhere but because Bleach had been constructing it in plain sight and trusting you not to see it. Aizen does not want power in the crude sense. He wants to stand above the heavens, above the system that created him, above the laws that govern Soul Society and the world beyond it. He believes this is his right. The show takes his argument seriously enough that he is genuinely threatening rather than cartoonish, and his presence casts a shadow across everything that follows him.
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Open page →Episodes 208–212 · Aizen's Secret Maneuvers
Aizen experiments on captains and lieutenants decades before his public betrayal, forcing Hollowfication onto the people who will become the Visored. Urahara tries to save them and is blamed instead, while Yoruichi helps him escape. The flashback changes the scale of Aizen's plan: the Soul Society arc was not the beginning. It was simply the moment he finally stopped hiding.
