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 intelligent and witty, 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.
Two of Yoruichi's unique items are accessories which grant the user the power of flight. A long, beige, bone wand-like artifact, with a small, white, bird-shaped skull, and four protrusions, similar to finger bones, extending from the back of the skull. By channeling Reiryoku into the wand, it produces a tentacle, which acts a harness, and a single bat-like wing manifests from the four bone protrusions, which acts as a one-handed hang-glider. No skill or previous experience is required to use it. Tentōken: It is a brown mantle, with a large drawstring closure at the collar and a large brooch displaying the Shihōin Clan crest. Like the wand, the Tentōken requires no skill or previous experience to use. It appears to be superior to the wand, since it allows one to hover in mid-air, and does not immobilize one of the user's hands. Anken: Small knives which Yoruichi hides in her boots. She can launch them at a target with a swing of her leg. Anti-Hierro Armor: A set of metal gloves and boots, invented by Kisuke Urahara, designed specifically to counter an Arrancar's Hierro during hand-to-hand combat. They are exceptionally durable, protecting the wearer's limbs even during the moment of their destruction. Razor Wire: Razor-sharp wire which Yoruichi carries on her person. She can trap an opponent in a field of it almost instantaneously, and according to her, it can harm someone as powerful as Yhwach should he try to move through it. Destructive Spheres: Somewhat small, light-colored spheres attached to each other by a string that Yoruichi throws at her opponent. According to her, once a sphere hits her opponent's body, a second sphere hitting that same area will destroy it. Feline Transformation: 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 highly skilled in the use of Shunpo. Though this is by no means a unique skill, as most seated officers are capable of performing it to various degrees, Yoruichi holds the title "Flash Goddess", shunshin; "Flash Master" in the English version), 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 , 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 could barely keep up with her while Yoruichi was still holding back. She can still perform Shunpo while in her cat form, however, she is not as fast as she is in her true form.