Sosuke Aizen 10 years after Thousand year blood war. He is still sealed in the deepest part of Muken, the Soul Society's most secure prison, with no significant change in his situation; he remains heavily sealed and unable to escape, continuing to be closely monitored by the Soul Reapers due to his immense power and past actions. While heavily restrained and sealed in a wall, He could still use his intelligence and charisma to manipulate situations or individuals if given the opportunity.

Kisuke Urahara (浦原 喜助, Urahara Kisuke) is the former captain of the 12th Division, as well as the founder and 1st President of the S.R.D.I.. His lieutenant was Hiyori Sarugaki. He lives in the Human World where he owns a small convenience store which sells Shinigami items. He is assisted by his employees Tessai Tsukabishi, Jinta Hanakari, and Ururu Tsumugiya. Kisuke is a tall, lean man with light skin and gray eyes. His hair is messy and light-blond (almost pale), with strands framing the sides of the face and hanging between his eyes, and he has chin stubble. He wears a dark green samue. Over this, he wears a black haori, which sports a white diamond pattern along its bottom half, reminiscent of an inverted captain's haori. Urahara carries a fan, which he occasionally uses to hide his face. He usually wears traditional Japanese wooden sandals (geta) and a striped dark green and white bucket hat (which usually shadows his eyes),which has earned him the nickname "sandal-hat" (ゲタ帽子, geta-bōshi; "Mr. Hat-and-Clogs" in the English ). During his earlier years in Soul Society, he had a clean-shaved face and wore the standard Shinigami shihakushō. In his more casual events, he usually wore his geta.He later wore a long-sleeved captain's haori after his promotion to the rank of captain. Optimistic: Urahara is generally laid back and optimistic. Humble: He is also a humble man. Eccentric: Urahara is eccentric and often goes over the top when he's passionate about something. Cunning: Urahara can be deceptively cunning and serious when the situation calls for it. Sarcastic: He speaks politely but has a sarcastic wit. Distracting: He often uses idle conversation and outward concern to distract his opponents. Prefers to stay on the sidelines: Urahara usually stays on the sidelines during important events, rarely intervening.