After his invasion and hulimiating defeat over Ichigo and Kisuke, Aizen seems to have reverted to his calm and nonchalant nature as he was sent to the 8th level of the Muken for the next 20 thousand years.

He also seemed to be dressed mainly in black with white trimming, with a massive black eyepatch over his right eye and black boots. His shoulders are draped with a ragged white cloth.

The tranquility inside the deep dark prison, however, is quickly disrupted when he senses another presence beside himself. "Oh? I see, I'm not alone here." Aizen evaluated his surroundings as he studied them.