Sōsuke Aizen

Sosuke Aizen is the main villain from the anime Bleach after the first visit to the soul society. He was originally a captain for the Gotei 13, before betraying them and creating his own army of Arrancar.

Origin
Aizen appeared to be a normal person as he grew up, but he never really seemed to care about anyone other than himself. He maintained a polite and friendly facade to lull those around him into a false sense of security. He was the captain of the 5th squad of the soul society and his Lieutenant was Momo Hinamori. Aizen was also the Lieutenant of Shinji Hirako until Aizen used Hollowfication on him and other vizards.



Arrancar
After obtaining the Hogyoku, Aizen started creating Arrancar out of Hollows, and inhabited Hueco Mundo, the planet of the Hollows. The elite he dubbed Espada, and he ruled over them. The Espada are the elite forces of his army which are: Starrk, Baraggan, Harribel, Ulquiorra, Nnoitra, Grimmjow, Zommari, Szayel, Aaroniero, and Yammy. All of the Espada can make the Arrancars in Aizen's army thier Fraccion if they choose too but only a few of the Espada have Fraccion. The Espada are Numbered 1 - 10 as said by Shawlong. Later in the Manga when Yammy releases his znapakuto and his number changes from 10 to 0 he says Espada are numbered 0 to 9 and he is the most powerful Espada besides starrk.

Zanpakuto


His zanpakuto, or sword, Kyoka Suigetsu, has the power to create illusions, a power he uses to his advantage when in the Soul Society, to fake his own death. He also made an illusion of Ulquiorra when Patros, Menis, Aldegor and they fought this illusion and won but left to the human world to find Kisuke Urahara to tell them how to use the Hogyoku.

Goals and Ambitions
Aizen's wants to create an army of Arrancar, become the King of the Soul Society, an be all powerful. He plans to create the Soul Key so he can enter the Soul Society King's Throne Room so he can kill the Soul Society King and stand above Heaven.