Aizen

Biodata

Power Progression

History

Fifth Division captain

Aizen cultivated a reputation as a gentle, capable captain and academy instructor while secretly conducting experiments intended to break the boundary between Soul Reapers and Hollows. Liu Hao identified him as the person behind the Hollowfication Incident and said Aizen sought to replace the Soul King 22 29 30.

After Liu Hao avoided his academy demonstrations, Aizen examined him under the pretext of treating a Kidō injury. Years later, Aizen requested Liu Hao’s transfer to the Fifth Division; when Liu Hao refused, Aizen instead arranged joint training with the Medical Guard Team 10 22 32.

During a Shikai demonstration, Aizen exposed Liu Hao and the team to Kyōka Suigetsu. Liu Hao subsequently learned to suppress its influence while convincing Aizen that he remained hypnotized 33 35.

Exposure and defection

Aizen continued investigating Liu Hao and Kaien Shiba, placing Kaien under surveillance and sending specially created Menos Grande against him. He later set a trap in Hueco Mundo to test Liu Hao’s resistance to hypnosis, strength, and susceptibility to Hollow power 82 85 109.

Aizen eliminated Central 46 and manipulated events surrounding Rukia Kuchiki’s execution to obtain the Hōgyoku hidden in her soul. After faking his death, he resurfaced, defeated Tōshirō Hitsugaya and Sajin Komamura, and extracted what appeared to be the Hōgyoku from Rukia. Liu Hao revealed that it was a fake and had prepared a Hollow capable of sealing Aizen’s Zanpakuto 109 111 112.

Hueco Mundo and Karakura Town

Aizen abducted Orihime Inoue and drew Soul Society’s forces toward Hueco Mundo. With the Garganta passages sealed behind them, he departed for Karakura Town, intending to use its Spiritually Dense Land to create the Oken. At the battle, he discarded his Espada, striking down Coyote Starrk and wounding Tier Harribel 134 160 172.

Liu Hao confronted Aizen and fought him as the Hōgyoku drove him through successive transformations. Gin Ichimaru turned on Aizen, but the Hōgyoku returned to him. Liu Hao ultimately separated it from Aizen, and a sealing Kidō planted by Kisuke Urahara suppressed Aizen’s power. Liu Hao chose to leave him alive to face defeat 178 184 189 190 201.

Appearance

Aizen initially appeared with short brown hair, black-framed glasses, and the white haori of a Fifth Division captain 110.

• His first Hōgyoku transformation covered him in pale, armor-like material; the full-body form left only his eyes visible 184 185.
• His later form had a black face, a vertical eye, six skull-bearing wings, and Kyōka Suigetsu fused to his right arm 193.

Personality

Aizen presented himself as a gentle, composed leader and an effective teacher. Beneath that public manner, he scrutinized others, used deception to protect his plans, and treated people as pieces to manipulate or discard 22 32 33 172.

He was confident in his intellect and power, dismissing the possibility that Liu Hao could escape Kyōka Suigetsu before eventually recognizing him as a major threat. His composure gave way to fury when Liu Hao repeatedly overwhelmed his evolved form 66 178 193.

After his defeat, Aizen reflected on his treatment of Momo Hinamori and came to recognize that he had sought understanding and an equal, but had pursued those desires through the wrong methods 201 202.

Abilities & Skills

Kyōka Suigetsu — Complete Hypnosis

Aizen’s Zanpakuto controls the five senses of those who have witnessed its Shikai release. He publicly represented it as a water-type ability that used mist and reflections to create illusions 22 109.

• Activation: Seeing the moment of release makes a target susceptible to subsequent hypnosis. Aizen stated that victims remain captive unless he dies or releases them voluntarily 29 109.
• Applications: He can alter a target’s perception of appearance, sound, texture, taste, and other sensations. He used an illusion to evade Hitsugaya’s attack and wound him 109.
• Mechanism: Liu Hao explained that the ability introduces light Reishi into the soul and controls its central nervous system 114.
• Counters and limits: Touching the blade before hypnosis activates can prevent its effect. Liu Hao used his Zanpakuto to remove the foreign Reishi and control what entered his body; a Hollow prepared by Urahara also temporarily sealed Kyōka Suigetsu’s release 30 112 114 189.

Hōgyoku evolution

Aizen used the Hōgyoku to transcend his Soul Reaper limits, referring to his control over it as “subjugation” rather than fusion 184.

• His wounds healed rapidly, and his transformed body resisted powerful attacks 184 185.
• His later form used Radiant Break, Ultimate Radiant Break, and Hadō #99: Five Dragon Destruction against Liu Hao 193.
• His regeneration did not prevent Liu Hao from removing the Hōgyoku or Urahara’s planted Kidō from sealing him afterward 201.

Kidō and combat

Aizen combined swordsmanship, speed, and powerful Reiatsu with advanced Kidō. He defeated Komamura using Kyōka Suigetsu and Black Coffin, though he said his incantationless spell had not reached one-third of its full destructive power 111 182 183.

• He used Kaidō to examine and treat Liu Hao’s apparent injuries at the academy 10.
• He used Hadō #99: Five Dragon Destruction during his transformed battle with Liu Hao 193.

Equipment and Items

• Kyōka Suigetsu — Aizen’s Zanpakuto and the source of Complete Hypnosis. During his final battle, its blade dissipated as Aizen declared he no longer needed a weapon 109 200.
• Hōgyoku — An object Aizen created and used to pursue power beyond a Soul Reaper’s limits. Liu Hao eventually separated it from him, and the Imperial Guard seized it 29 184 201.
• Hōgyoku extraction device — A cylindrical device Aizen used to remove the object hidden in Rukia’s soul 111.
• Concealment cloak — Equipment obtained from Urahara that could hide its wearer’s presence and Reiatsu; Aizen, Gin, and Tōsen used such cloaks during the encounter involving Isshin Shiba and White 30.

Relationships

• Liu Hao — Initially a subject of Aizen’s recruitment efforts and scrutiny, Liu Hao became his principal opponent. He resisted Kyōka Suigetsu, removed the Hōgyoku from Aizen, and chose to spare him 22 67 178 201.
• Momo Hinamori — Aizen’s vice-captain admired and trusted him. He used her as a decoy; after his defeat, he recalled taking her sincerity for granted 108 198 202.
• Gin Ichimaru — An apparent ally who secretly stayed close to Aizen to recover what had been taken from Rangiku Matsumoto. Gin eventually attacked him 29 189 203.
• Kaname Tōsen — Aizen’s ally in his secret operations. Aizen later cut Tōsen down during the battle in Karakura Town 29 82 177.
• Kisuke Urahara — Aizen sought the Hōgyoku Urahara had hidden inside Rukia. Urahara later fought him and planted the Kidō that sealed his power 111 184 201.
• Coyote Starrk and Tier Harribel — Members of Aizen’s Espada whom he discarded during the Karakura Town battle, striking Starrk down and wounding Harribel 172.

Notable Quotes

“It wasn’t deception, really. You simply didn’t know the real me.” 108

“The ability of my Zanpakuto, Kyōka Suigetsu, is Complete Hypnosis.” 109

“This isn’t called fusion. Please describe it as... subjugation, won’t you?” 184