Sōsuke Aizen

Sōsuke Aizen is the former captain of the 5th Division in the Gotei 13. He later leaves Soul Society with his followers, Gin Ichimaru and Kaname Tōsen. His lieutenant was Momo Hinamori. After waging war against Soul Society with an army of Arrancar, Aizen was defeated by Ichigo Kurosaki and sealed away by Kisuke Urahara, and then imprisoned for his crimes. Prior to his departure from Soul Society, Aizen appeared as a mild-featured man with brown scholarly hair enhanced by square glasses, along with soft brown eyes. He wore the standard Shinigami uniform with a captain's haori. During his ascent to Hueco Mundo, he removed his glasses and swept his hand through his hair, revealing menacing eyes and a very different hairstyle; his hair is now swept back, with a strand hanging down his face. In Hueco Mundo, Aizen initially wears Arrancar clothes over his shihakushō. After Orihime Inoue is taken to Las Noches, Aizen wears full clothing similar in style to the Arrancar, complete with a pink sash around the waist. Upon his defeat by Ichigo Kurosaki, Aizen loses all of the physical changes made by his transformation and returns to the physical form he had prior to transforming.


Aizen is a 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. Whenever confronted, Aizen is casual and uncaring, attempting to draw out a conversation and make small talk, which often infuriates those he is talking to. Aizen initially appeared to be a very kind, well-respected captain and was looked up to by many, especially his lieutenant, Momo Hinamori. However, this was just a mask to disguise his manipulative, and very dangerous, nature. In truth, he cares very little for his underlings, and is willing to use almost everyone around him as pawns to achieve his goals. He is willing to stop at nothing to further his selfish ambitions, including manipulating or killing anyone if he deems it to be necessary. He frequently toys with his underlings for amusement. During his time as a captain, Aizen liked tofu, but he disliked boiled eggs. In his free time, he often read, and he gave a special lecture of calligraphy at the Shin'ō Academy because he excelled in this branch of arts. This optional course was immensely popular among the Shinigami students, and many of them felt great sorrow at Aizen's sudden departure. As the commander of his army of Arrancar, Aizen controls his minions through acquired respect or fear. Ulquiorra Cifer revealed to Orihime Inoue that they are all there to further Aizen's ambitions. Aizen keeps more rowdy individuals like Grimmjow Jaegerjaquez in line through intimidation and mind games. The Arrancar Aisslinger Wernarr claims the Arrancar follow him because he has no fear, something which beings born from fear and despair find inspiring. Gin Ichimaru has some sense of Aizen's emotions and feelings, correctly pointing out Aizen was enjoying the invasion by Ichigo and his friends and their successes within Las Noches, which Aizen himself confirmed, and noting Aizen was surprised by the arrival of Momo during the battle of Fake Karakura Town. In contrast, Kaname Tōsen has shown no such understanding, and has fallen victim to one of Aizen's more minor mind games when Aizen subtly manipulated him into punishing Grimmjow for him while Aizen himself kept up his appearance of benevolence. Aizen's true objective was to overthrow the king of Soul Society. As he and his fellow traitor captains were departing from the Soul Society, he told 13th Division Captain Jūshirō Ukitake "no one has stood on the top of the world", not even the gods, but he aspires to "stand on the heavens and end the unbearable vacancy on the world's throne". According to Kisuke Urahara, since mastering the Hōgyoku, Aizen has become less cautious in battle, for Aizen would not have allowed Urahara to use level 90 Kidō before he subdued the Hōgyoku. Aizen admits his new powers allow him to let his guard down.  Due to this newfound power, Aizen has developed an arrogant and overconfident attitude, often not even thinking his attacks or defense through any longer like he used to, or even bothering to find out the effects of his opponents' and his own attacks. In his newest form, he has developed a severe superiority complex, believing he is now above both Shinigami and Hollows. Because of his superior attitude and high intelligence, Aizen is easily enraged when facing something or someone which he does not understand; for example, when witnessing Ichigo Kurosaki use Saigo no Getsuga Tenshō, Aizen becomes furious because he is unable to comprehend how a Human has surpassed him.


At an unknown point in the past, Aizen became part of the 5th Division under Captain Shinji Hirako. He invested himself in the research and creation of the Hōgyoku even before Kisuke Urahara. To this end, he sacrificed hundreds of Shinigami and hundreds of Rukongai citizens who bore Shinigami talents to his own Hōgyoku, but it was not satisfied with this. At one point, a young Gin Ichimaru watched Aizen meet with three other Shinigami who were kneeling before him. One of the Shinigami handed Aizen the Hōgyoku, prompting Aizen to put the orb in a glass and hand it back to the Shinigami. Aizen and his subordinates left an unconscious Rangiku Matsumoto a short distance away. Aizen eventually caught Shinji's attention, and was promoted to a lieutenant in order for Shinji to watch over him closely, but Shinji's action only helped further the realization of his plans. 110 years ago, Aizen made his way to the 5th Division living quarters of his captain. He and Shinji discussed style and trends before they made their way to the promotion ceremony being held at the 1st Division headquarters. As they got there, he witnessed 12th Division Lieutenant Hiyori Sarugaki attack her captain, and watched as the two got into a childish argument. He followed behind while the other captains congregated and had a brief discussion on the status of the Gotei 13. Overhearing 8th Division Captain Shunsui Kyōraku mention that the previous captain of the 12th Division was promoted, Aizen interrupted and asked Shunsui what he meant by this. When Aizen initially conjectured that the promotion was to Central 46, Shunsui explained it had nothing to do with the Central 46 and revealed the previous 12th Division captain, Kirio Hikifune, had been accepted into the Royal Guard, shocking Aizen. The following night, after Urahara's appointment as the new captain of the 12th Division, Shinji had a short talk with him about his new role as captain. While leaving, Shinji revealed Aizen, who had been concealed behind camouflage. Complimenting his captain, Aizen asked Shinji when he sensed him there. Stating he had known ever since Aizen was in his mother's womb, Shinji ordered Aizen to follow. Noting his disapproval, Aizen commented on how scary a person Shinji was, prompting Shinji to say that Aizen was the scary one. The next night, Aizen saw Gin killing the 3rd Seat of their division. Informing Gin he was impressed by his skill, Aizen asked him how he found the fight, prompting Gin to state he found it pathetic. 9 years later, Shinji and Aizen were walking around the Seireitei when they came across Urahara, Hiyori, and 12th Division 3rd Seat Mayuri Kurotsuchi. While Shinji once again engaged in a childish fight and argument with Hiyori, Aizen asked Urahara if he had heard the news. When Urahara told Aizen he had not, Shinji told Urahara about the series of strange deaths which had taken place in Rukongai and informed him the 9th Division had been sent to handle the investigation. With the disappearance of the 9th Division, Captain-Commander Genryūsai Shigekuni Yamamoto called an emergency meeting and assembled a team to investigate. After coming into contact with Hollowfied 9th Division members, the investigation team was dispatched by an unseen assailant. While the investigation team was still out searching, Shunsui and some other Shinigami on guard saw someone whom they believed to be Aizen. It was later revealed 9th Division 5th Seat Kaname Tōsen was behind the betrayal of the 9th Division, having stabbed Kensei Muguruma in the back and killed Heizō Kasaki, Shinobu Eishima, and Tōdō Izaemon, who had accompanied Kensei. He subsequently subdued the team sent to locate the missing 9th Division members using his Bankai. When an injured Shinji asked Tōsen why he betrayed his captain, he was surprised to be answered by Aizen, who stated Tōsen did not betray anyone and faithfully followed his orders.

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