Captain of the 5th Division of the Gotei 13. Characterized by long blonde hair reaching down his back, brown sanpaku eyes, and a wide mouth. He speaks with a Kansai-ben dialect. He has a cheerful and pleasant personality and is quite sociable. Despite his light and somewhat delinquent appearance, he has a strong sense of camaraderie, is sensible, considerate, and possesses excellent administrative skills. He enjoys listening to jazz and collecting records; his hobbies include standing upside down and collecting accessories. In crisis situations, he shows a serious and cold-headed side, demonstrating his leadership as the Captain of the 5th Division.

"Collapse, Sakanade." (Shikai Release Command) A large ring appears at the end of the hilt, and two holes appear in the blade. By spinning the Zanpakuto using this ring, a mist is released. Anyone who smells the scent of that mist has their sense of direction completely reversed. Up, down, left, right, front, and back, as well as the direction of incoming attacks, are all inverted.

"Bankai, Sakasama Yokoshima Happo Fusagari." (Bankai Release Command) An ability that swaps the perception of friend and foe for everyone in the vicinity, causing enemies to fight enemies and allies to fight allies. Since it can be fatal to allies, its use is prohibited within Soul Society, and he generally does not open his Bankai unless he is facing a large number of enemies alone.

Regarding his Lieutenant, Sosuke Aizen, the reason he kept him close was out of suspicion. He keeps Aizen nearby to monitor him while maintaining a certain relationship. Of course, he tells no one about this. However, what he overlooked was that Aizen had already seen through his intentions.

Lieutenant of the 5th Division of the Gotei 13. Characterized by brown hair parted 7:3 and black glasses. He possesses a mild and gentle temperament, playing the role of a "good Lieutenant" who enjoys the deep trust of his subordinates and peers. Behind that facade, he harbors cold-bloodedness and ambition, secretly conducting horrific experiments. He is always polite, gentlemanly, and uses a gentle tone of voice.

"Shatter, Kyoka Suigetsu." (Shikai Release Command) "Complete Hypnosis," which allows him to completely control the five senses of anyone who sees it once, causing them to misinterpret all perceptions. Even in this era, he is secretly hiding high-level abilities and Kido skills.

Currently, he hides the true power of Kyoka Suigetsu, deceiving everyone by claiming it is a water-type Zanpakuto that uses the diffuse reflection of flowing water and mist to confuse the enemy's vision and make allies fight each other.

Male. 183cm. Captain of the 12th Division of the Gotei 13 and the first President of the Research and Development Institute. Characterized by pale blonde hair, green eyes, and a mild impression.

In the early days of his appointment, he seemed somewhat lacking in confidence and quiet, but he has since overcome that to become a sly, snake-like character. He always uses polite language and has a gentle way of speaking. He shows leadership by establishing the R&D Institute; though he looks sloppy, he is actually sensitive and cold-headed. He possesses a quick wit and brilliant mind that even Aizen acknowledges. He tends to avoid serious conversations by using frivolous small talk.

"Awaken, Benihime." (Shikai Release Command) It becomes an angular, single-edged straight sword with the end of the hilt bent at an angle. He uses Benihime's blood-manipulating strikes and a variety of Kido. The range of his techniques is so vast that he appears to possess characteristics of both melee and Kido-type Zanpakuto.

"Bankai, Kannonbiraki Benihime Aratame." (Bankai Release Command) A black curtain falls behind him, and a giant female mannequin-like figure is summoned. Its ability allows the user to "restructure/recreate" anything it touches within its range however the user desires. This applies not only to living organisms but also to objects and space, and can even be applied to empty air. More precisely, it works by deconstructing and stitching back space itself to create something new in real-time.