"The gaze into the sun." - Tite Kubo Sōsuke Aizen (藍染 惣右介,Aizen Sōsuke) is the former captain of the 5th Division in the Gotei 13; he later leaves the Soul Society with his followers, Gin Ichimaru and Kaname Tōsen. His lieutenant was Momo Hinamori. He was the main antagonist from the start of the series to the conclusion of the Fake Karakura Town arc. After being defeated in Karakura Town by Ichigo Kurosaki and being imprisoned in the Avici prison by the Central 46, he's soon freed by Akuma Hakaishin and is restored his powers by him in exchange for joining his army. He becomes a Demon Lord and is Akuma's #1 advisor.