Sōsuke Aizen is a fictional character from the anime and manga series Bleach, created by Tite Kubo. He is known for being one of the main antagonists in the series, initially appearing as a captain in the Soul Society. Aizen is highly intelligent and possesses powerful abilities, including the use of Kido and Zanpakutō. Aizen's character is marked by his calm demeanor and manipulative nature. He orchestrates complex plans to achieve his goals, often deceiving other characters. His ultimate ambition involves obtaining the Hōgyoku, a powerful artifact that grants immense strength and the ability to transcend traditional limits.