Sōsuke Aizen (Lord Aizen)

Sōsuke Aizen is the main antagonist of the manga/anime franchise Bleach. He served the Gotei 13 as the captain of the 5th Division, until he revealed himself to be a traitor and abandoned the Soul Society when he, Gin Ichimaru, and Kaname Tōsen murdered members of Central 46. Following his betrayal, he managed to obtain the Hogyoku and planned to use it to create the Ōken from the souls of Karakura Town, using it to kill the Soul King and recreate life under his image. After his defeat by Ichigo Kurosaki, Central 46 announced Aizen's sentence to an eighth and final level of an underground prison known as Muken for initially 18,800 years until his sentence has increased to 20,000 years for his insolence towards Central 46 officials. He was temporarily paroled out to assist his nemesis, Ichigo Kurosaki, against Yhwach. After Yhwach's defeat, he was sent back to Muken to finish his sentence.