What is Captain Sosuke Aizen's power?

Answer 1

Kyōka Suigetsu (鏡花水月, Mirror Flower, Water Moon): In its sealed form, it resembles a normal katana. The only decoration is the crossguard, which is a hexagon instead of a rectangle. The two sides parallel to the blade are long, whereas the four sides above and below the blade are shortened, making it into almost a diamond or prism-like shape. It has a green handle.

• Shikai: The release command is "Shatter" (砕けろ, kudakero) and is used to both activate and deactivate it.[103]The name Kyōka Suigetsu hints at its illusionary properties; the moon reflected in water and a flower in a mirror are things that can be seen but not held. It is a Chinese saying for seeing and desiring something that is a dream that cannot be easily grasped in hand, teaching people about temptations.

Aizen using Kyōka Suigetsu's hypnotic abilities.

Shikai Special Ability: Kyōka Suigetsu's Shikai ability is Complete Hypnosis (完全催眠, kanzen saimin). [104] It controls the five senses to the point that it can make the target misinterpret another person's form, shape, mass, feel and smell to be that of the enemy. The initiation condition for the hypnosis is to show the enemy the release of Kyōka Suigetsu. After seeing it just once, that person will completely succumb to the hypnosis. After that, every time it is released, that person will become Aizen's unwilling slave. Since the spell works when you see the ritual, those who can not see are consequently immune to the hypnosis.[105] When he turns off the hypnosis by force of will, the image shown melts away/shatters. Kyōka Suigetsu's Complete Hypnosis is absolutely flawless; even if the target is aware that they are under the hypnosis, they cannot resist its influence.[106] Kyōka Suigetsu's hypnotic abilities make it a highly useful tool in combat, as Aizen can quickly create simple or complex illusions to deceive opponents. By creating a decoy of himself, or other illusions to distract his opponents, Aizen can hide his own movements and attack with impunity; his opponent, meanwhile, will remain focused on the illusion until it's too late to react.[107][108]While the illusions Kyōka Suigetsu creates are quite powerful, those with considerable power and skill themselves may be able to note slight differences in the illusions compared to the real thing, even if they are not able to determine what, precisely, is different. Captain Retsu Unohana was able to detect something was amiss with Aizen's fake corpse, even though she did not realize what until seeing Aizen alive. This is how Aizen has deceived many people and killed them, including one of his own allies, the Tres Espada, Tia Harribel.[27]