Name: Yoruichi Shihōin
Birthday: January 1st
Weight: 93 lbs
Affiliation: Shihōin Clan, Soul Society
Previous Affiliation: Gotei 13
Previous Position: 22nd Head of the Shihōin Clan, Captain of the 2nd Division,
Onmitsukidō Commander-in-Chief, Corrections Corps Corps Commander, Executive Militia Corps Commander
Previous Division: 2nd Division, Onmitsukidō
Partner: Kisuke Urahara
Previous Partner: Suì-Fēng, Marenoshin Ōmaeda
Base of Operations: Urahara Shop, Karakura Town
Yoruichi Shihōin was born the princess of the Tenshiheisōban (House of Godly Gears), the Shihōin Clan, one of the four noble families. Yoruichi grew up at the Shihōin Mansion in the Seireitei of Soul Society with her childhood friends Kisuke Urahara and Tessai Tsukabishi. During this time, they played together daily under the Sōkyoku hill training space, which Urahara built when they were children. Later, Yoruichi became the Corps Commander of the Executive Militia of the Onmitsukidō while serving as the 22nd generational Head of the Shihōin Clan, becoming the first woman to ever hold the position. Some time later, she would serve as Commander-in-Chief of the Onmitsukidō, as the position is traditionally held by the heads of the Shihōin Clan. She eventually rose to the position of captain of the 2nd Division of the Gotei 13, further uniting the formerly separate military arms together, as this was also traditionally done by her family. Some time later, she decided to change her role in the Onmitsukidō from being the Corps Commander of the Executive Militia, which is the position traditionally held by the Commander-in-Chief, to being the Corps Commander of the Corrections Corps. While Yoruichi was Onmitsukidō Commander, she took in Suì-Fēng as a personal bodyguard. Recognizing her talent, she became a mentor and friend. She taught Suì-Fēng most of the techniques she knew. During her time in Soul Society, she created many techniques which involved Shunpo, and taught some of them to Byakuya.
About 110 years ago, Yoruichi recommended that Kisuke Urahara, her 3rd Seat, be appointed to the recently opened position of Captain of the 12th Division after the former captain, Kirio Hikifune, was promoted. Prior to presenting Urahara with the news of the open position, Yoruichi had a sparring session with him at the Sōkyoku Hill training space. Before retiring to the 2nd Division barracks, Yoruichi informed Urahara she had recommended him for the position. Suì-Fēng confronted Yoruichi, concerned that she was overestimating Urahara's capabilities, and proceeded to explain she believed it had been a mistake to appoint him as Corps Commander of the Detention Unit. Suì-Fēng continued by stating he was undeserving of such a position. While Yoruichi readily admitted that Urahara was not really a hard worker, she dismissed Suì-Fēng's criticisms, playfully insinuating that her focus on him must have romantic connotations, which Suì-Fēng denied. After spending the day following Urahara around Soul Society taking notes, Suì-Fēng returned to the 2nd Division barracks to show Yoruichi her evidence of Urahara's lack of competence in his position, only to find Urahara already there talking with Yoruichi. Suì-Fēng is told Urahara would be taking the captain proficiency exam, to which she stands in disbelief. Yoruichi, confirming it, further requested Suì-Fēng attend the exam as well. She explains that normally only captains are allowed to attend, but she had asked special permission to allow Suì-Fēng to attend. Suì-Fēng was at first confused about why she should attend, but Yoruichi told her there was no need to keep secrets, as she knew she was attracted to Urahara, which Suì-Fēng again denied. Yoruichi explained she knew all about how Suì-Fēng had been following Urahara around all day. Suì-Fēng admitted she was following Urahara around, but stated it was to prove he was lazy, incompetent, and unworthy of Yoruichi's praise. Suì-Fēng handed her notes to Yoruichi, who, reading them, commented on how detailed they were. When Urahara didn't deny any of the information in the report, Suì-Fēng was shocked he would be so honest about his seemingly unprofessional actions. An unsurprised Yoruichi, stating Urahara never changes, praised Suì-Fēng for her intelligence gathering skills. Suì-Fēng, happy at first, realized Yoruichi regarded the notes not as intelligence information, but rather as a love letter. Suì-Fēng was reasonably distressed, and Yoruichi, laughing it off, told her to loosen up, as she wasn't serious. They were interrupted by the arrival of a squad member, who delivered a message that the people Urahara had been looking for had been found. Suì-Fēng replied that if he didn't return in time, it would put a strain on the 2nd Division's reputation and Yoruichi's. Yoruichi, dismissing this, told Urahara to hurry off to his duty, and told Suì-Fēng to help prepare for Urahara's Captain's Proficiency Test. Yoruichi is later seen among the other captains awaiting the start of the ceremony. Upon Urahara's arrival to the 1st Division barracks, where he was formerly introduced to the other captains, he was chastised by Yoruichi for being so reluctant. She told him he was already a captain, so he should stand tall. A day or so after Urahara took over the 12th Division, Yoruichi was told by an Onmitsukidō member that Urahara had entered the Detention Unit property, claiming he had been given approval to go. Yoruichi couldn't recall when or even if he asked for permission or whether she granted it, but when asked if she wanted him removed, she nonchalantly told her division members not to bother and to allow him to go where he liked. When asked if she remembered the incident in question, Yoruichi plainly said no. Suì-Fēng, becoming distressed, prepared to voice her disapproval, but Yoruichi told her to calm down, as it was Kisuke they were talking about, stating he must have had an idea of some kind. Yoruichi appeared to be on good terms with the members of the Kuchiki noble Clan as she would often visit the Kuchiki Manor to play tag with a teenage Byakuya Kuchiki. On one such occasion, she was asked to train Byakuya by his grandfather Ginrei Kuchiki, the Head of the Kuchiki Clan and the 6th Division captain. Upon seeing the arrival of Yoruichi, Byakuya swung his sword at her, calling her a were-cat. Yoruichi, laughing, began to playfully tease him, calling him "Little Byakuya". She complained about receiving such a greeting after coming all the way there to see him. Byakuya yelled at her, saying he didn't want to see the likes of her, and he would be the head of the Kuchiki Clan soon enough, so he had no time to waste on her. While asking if that was the case, she stole the ribbon holding his hair back. Byakuya, quickly turning, swung his sword at her, but she easily dodged it. Yoruichi, laughing at him, exclaimed that if the head of the Kuchiki Clan could get his hair-tie stolen by a girl who is just playing, then the future of the Kuchiki Clan had become bleak, though this was just a ploy to entice him into another game of tag. Not to be defeated so easily, Byakuya told her not to move an inch, but before he could finish, she, telling him he couldn't catch her, used Shunpo to begin the chase. Byakuya stated he could see she wished to incite his wrath, and he promised to make her see the error of her ways, further claiming his Shunpo was far superior to hers. 9 years later, Yoruichi is seen at an emergency meeting of the captains of the Gotei 13, where the Captain-Commander was giving an intelligence report on the disappearances of the 9th Division Captain Kensei Muguruma, Lieutenant Mashiro Kuna, and the other high-ranking members of their division, stating they had previously been sent out to investigate the disappearance of other division members, and declaring he will choose 5 captains to form an investigation team. When a very winded and frantic Urahara showed up to ask that he be allowed to go with the investigation team, as he had previously sent his Lieutenant Hiyori Sarugaki to the site of the disappearances, he was summarily told no by Captain-Commander Yamamoto. When he protested, he was chastised by Yoruichi, who told him he was acting pathetic and that he should get a grip on himself. She further stated he sent Hiyori himself, and for him to lose his composure like that only insulted her. The Captain-Commander continued naming the members of the investigation team, telling Yoruichi she was to standby for further orders. The next day, Urahara and Tessai were arrested under the orders of the Central 46. It immediately became evident they had been set up by Aizen, but were given no right to defend themselves and prove their innocence. As a result, they were quickly given their sentences. For "committing crimes against researching and invoking forbidden phenomenon" and "deceiving and inflicting grievous injury to fellow Shinigami", Urahara was sentenced to become Human and to be exiled to the Human World. For "using forbidden Kidō techniques", Tessai was sentenced to life imprisonment in a Level 3 detention area. Before either of their sentences could be executed, a masked Yoruichi, entering the building, knocked the guards unconscious and rescuing the disgraced former captains, bringing them to a secret underground area. In this secluded area, she expounded how mad she was at them for excluding her from their plan. She revealed she had brought the eight Hollowfied Shinigami and the prototype Gigai Urahara was working on. With that epiphany, Urahara resolved to make ten Reiatsu-blocking Gigai to aid him and Tessai. Tessai stated his fear about Yoruichi's safety, but she calmly stated they should not worry about her, as she would escape somehow. When she left Soul Society, she left behind her titles and positions, and was thus relieved of her high status. She was succeeded as 2nd Division Captain and Commander of the Onmitsukidō by her protégé, Suì-Fēng, at a later date.