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Name: Sosuke Aizen
Age: Well over 110 years.
Appearance:
Bio: Little is known of Aizen's past, except that he spent much of his career in the 5th Division, eventually becoming its Lieutenant under the former Captain, Shinji Hirako. Shinji kept Aizen under his view during this time because he felt there was something dangerous about him. Also, during that time, Aizen met Gin Ichimaru and Kaname Tōsen, and somehow managed to lure them to his side. 100 years ago from the current time, Aizen engaged in early experiments on Shinigami/Hollow hybrids which involved using an unknown device to cause spirits to transform into Hollows. He is responsible for turning his former Captain Shinji and 7 other Shinigami into Vizards in the first place. Aizen became Captain of the 5th Division later on, and Gin eventually became his Lieutenant and right hand man. Gin and Tōsen later became Captains of the 3rd and 9th Divisions, respectively, but remained loyal only to Aizen. According to Aizen, even when Hinamori was his Lieutenant, he thought of no one but Gin as his subordinate. At some point, he also saw the potential of Momo Hinamori, Izuru Kira, and Renji Abarai, and took them all into his division. While Kira and Hinamori were obedient and loyal, becoming the Lieutenants of the 3rd and 5th Divisions under Gin and Aizen, respectively, Renji proved to be too rebellious and was transferred to the 11th Division (and later to the 6th, where he too became a Lieutenant).

Despite his current villainous status and former position of authority, Aizen is a surprisingly polite, soft-spoken intellectual, often addressing his subordinates by their given names. He rarely shows any sign of alarm or distress and often has entire situations planned out well in advance. Aizen initially appeared to be a very kind, well-respected Captain and was looked up to by many, especially his Lieutenant Momo Hinamori. This however was just a mask to disguise his true manipulative and very dangerous nature. In truth, he cares very little for his underlings (both past and present), and is willing to use almost everyone around him as pawns in his twisted game of "chess". In his own words, Aizen claims to be unaffected by any form of morals or ethics, which he views as a mere restriction on his potential. He is, therefore, willing to stop at nothing to further his selfish ambitions, including manipulating or killing anyone if he deems it necessary. He is fond of long, complicated, and somewhat convoluted plots, many of which do not have any real reason until he reveals them, and frequently appears to toy with his underlings for amusement.

Aizen's true objective is to overthrow the king of the Soul Society. As he and his fellow traitor Captains departed the Soul Society, he told Jūshirō Ukitake that "no one has stood on the top of the world", not even the gods, but he aspires to "stand in the heavens and end the unbearable vacancy on the world's throne". To do this, he needs the Royal Key, a tri-pronged golden key that opens a portal to the dimension that the Soul King resides in. While the location of the key is known only to General Yamamoto, Aizen knows how the original was created and how to manufacture another. To do this, 100,000 souls need to be gathered together (which will kill all the entities used) and vaporize a significant portion of the area used in its forging. His sights are therefore set on Karakura Town, which has an unusually large concentration of spirit particles.

Name: Kaname Tousen
Age: Well over 110 years.
Appearance:
Bio: Tōsen dedicated his life to following the path with the least bloodshed when a woman special to him died. She herself followed this path and Tōsen idolized her for it. Her dream was to become a Shinigami and use her powers to maintain a peaceful world. Soon after she was accepted by the Academy, however, her husband killed her because she scolded him for killing a comrade over a petty argument. Tōsen took her Zanpakutō upon her death and vowed that he would fight for justice without unnecessary bloodshed from then on. Shortly after, Tōsen joined the Shinigami. Tōsen met up with his now good friend, Sajin Komamura, while he was still in the Shinigami Academy. They took to each other quickly, because at that point Komamura was ashamed of his fox head and Tōsen could not see it. Komamura joined the Shinigami and they became close friends and eventually captains in the Gotei 13, though the exact details aren't known. Before being transferred into the 9th Division, it was known that Tōsen was in the 5th Division. When Sōsuke Aizen was still the lieutenant of the 5th Division, Tōsen was already on good terms with him.

A century before the main storyline, Tōsen was the 5th Seat of the 9th Division under captain Kensei Muguruma. At this point, he was already Aizen's subordinate, as he betrayed the 9th Division by killing the seated members and stabbing Kensei from the back, also helping to subdue the team sent to stop Kensei and Mashiro Kuna after they transformed into Hollows. He is seen striking Love Aikawa and others in the back before Aizen appears declaring it was under his orders that he did it. When Kenpachi Zaraki came into Seireitei and killed the former captain of the 11th Division. Ever since that day, Tōsen saw Kenpachi as a monster who served no purpose but to create chaos and would eventually break the tenuous peace of Soul Society.