About me: Yoruichi Shihōin is a slender, dark-skinned woman of average height, with golden-colored eyes and long purple hair, which she keeps up in a ponytail. Her standard attire consists of a black, backless, sleeveless undershirt, an orange over-shirt with two white straps on each shoulder, a large beige sash around her waist, and black stretch pants with a pair of lightweight brown shoes, which allow for stealth and easy use of Shunpo. She previously wore a beige neck warmer, which she pulled up to cover her face in order to hide her identity, but seems to have forgone its use. She occasionally wears long beige wrist and leg warmers, each secured by bands. She, unlike any other known Shinigami, can transform into a small black cat for long periods of time. In this form, she has a distinctive male voice and golden eyes.
110 years ago, during her time as a captain, she wore the same sleeveless and backless Onmitsukidō uniform, with long black wrist guards which Suì-Fēng wears now, but had a black ribbon tied around her neck. She wore a long-sleeved captain's haori. Her hair was much shorter, cut in a style similar to Suì-Fēng's current hairstyle, but without the braids. At some point prior to this, she wore the white Onmitsukidō uniform of the correction corps.
Yoruichi is an intelligent and witty woman, holding an intimate knowledge of Soul Society and its workings, as she was the former leader of the Onmitsukidō and the Second Division's captain. Although of noble birth, she acts differently from most other nobles, very much like Kaien Shiba. For instance, she instructed Suì-Fēng to refer to her without using honorific suffixes, but reluctantly settled for being called "Yoruichi-sama" ("Lady Yoruichi" in the dub). On several occasions, she transforms into her Human form directly in front of Ichigo just to see his reaction to seeing her naked, which she teases him about. In addition, she speaks in a dialect used by elders, such as identifying herself as "washi" (a term usually used by old men to define themselves with), instead of more feminine terms like "watashi", in both her Human and animal forms.
While it is unknown how she obtained her cat transformation, she appears to prefer spending most of her time in it. Upon showing her Shinigami form to Ichigo, she forgot to put on clothes, as she had grown used to not needing them; due to being in cat form for so long. She especially takes delight in transforming in front of people to see their shocked reaction, due to her cat form making her sound male. Her love for her cat form extends to great anger should someone harm it or insult its appearance, as seen from how upset she got after her tail was damaged.
Although relatively calm and mature when a situation calls for it, Yoruichi is quite laid-back and playful, often teasing or flirting with those younger than her, such as Ichigo Kurosaki at the underground hot spring, a younger and hot-headed Byakuya Kuchiki, Suì-Fēng before her time as a captain, and Kisuke Urahara, childhood friend, former underling, and fellow ex-captain. Yoruichi prefers to drink milk, which fits with her practice of transforming into a cat.
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.
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.
Ichigo engages in battle with Byakuya, and Yoruichi arrives just in time to stop the release of Senbonzakura's Shikai. Byakuya notes she is the former Commander-in-Chief of the Onmitsukidō, and the former Corps Commander of the Correction Corps. Byakuya states it's been a hundred years since her disappearance, and that everyone thought she was dead. Yoruichi, rushing towards Ichigo, impales his bandaged chest wound with her hand, causing him to pass out.
Ukitake speculates that Yoruichi inserted a strong tranquilizer directly into Ichigo's body in an attempt to save him. When Byakuya states she won't be able to get away so easily, Yoruichi says he is talking big, asking him if he ever won even one game of tag against her. The two engage in a test of speed using Shunpo, Yoruichi managing to stay a step ahead of Byakuya despite carrying an unconscious Ichigo. Yoruichi perches upon Byakuya's outstretched arm. She states he can't catch her with that level of Shunpo, and quickly moves to the top of a nearby building. She yells down to Byakuya that in three days, she will make Ichigo stronger than him, and until then, the fight between the two will be on hold. As she uses Shunpo to leave, she tells Byakuya he can follow her if he chooses, but the "Goddess of Flash" will not be caught so easily.
When Yoruichi finally gets Ichigo back to the secret underground area, she, looking down at him, tells him to wake up, stating he can get stronger, and that when he wakes up, she will tell him about Zangetsu's real power.
When Ichigo awakens, Yoruichi tells him they have no time to wait for his wounds to heal completely, so his wounds will hurt quite a bit. Before she can go, Ichigo asks her why he was the only one she brought back. He expresses his rage, stating he is the only one back there who could have survived. Yoruichi calmly tells him not to think so highly of himself, for no one there, not even Ichigo, would have survived a fight against Byakuya. She adds that to remain able to outrun Byakuya, one person is all she could carry. Yoruichi states she brought him back because, with some training, it may become possible for Ichigo to defeat Byakuya. Yoruichi tells Ichigo that aside from Byakuya, Ukitake was also there; even though Ganju is an intruder and Hanatarō is a traitor, Ukitake will not let them die because they were trying to save Rukia, who is one of his subordinates. She further assures him not to worry because in three days, she will make him strong enough to defeat Byakuya and save everyone.
Yoruichi possesses the unique ability to shape-shift into a black cat at will. How she alone, out of all Shinigami, is capable of this is currently unknown. She has possessed the ability for well over 100 years, and it is known to others she knew from that time. She apparently has no set time limit on the transformation, as she had been in this form for over 100 years. In cat form, Yoruichi can still channel her spiritual energy and move at incredible speeds, though she is physically limited. Her transformation grants her a complete disguise, as her voice in this form is deep enough to lead most to assume she is a male.
Shunpo Master: Considered to be the most proficient Hohō master ever in all of Soul Society, Yoruichi is immensely skilled in the use of Shunpo. Yoruichi holds the title "Flash Goddess", because she has mastered this ability to the point where she can appear to be in several places at once and wipe out an entire Onmitsukidō squadron in seconds. She can easily close tremendous gaps of distance in the blink of an eye while remaining undetected, and can surprise Byakuya, who is one of the most proficient masters in the art as well. She has mastered all of the Onmitsukidō's speed-oriented techniques, and has even created some of her own, such as Utsusemi (空蝉, Cicada, referencing their molting). The full extent of her abilities remain unclear, but she was able to outrun Byakuya while carrying an unconscious Ichigo over her shoulder, performing around 300 steps before feeling tired from being 100 years out of practice. Suì-Fēng was able to strike Yoruichi multiple times, but was unable to hit her in the same spot twice with her Zanpakutō. She can still perform Shunpo while in her cat form, however, she is not as fast as she is in her true form.