Soifon (often incorrectly romanized as Soi Fong) is the Commander-in-chief of the Onmitsukidō and the captain of the 2nd Division in the Gotei 13. Her lieutenant in the latter unit is Marechiyo Ōmaeda.
A relatively short and petite woman with lightly tanned skin and black hair. She wears the traditional Shinigami Captain's uniform with a sleeveless haori and a yellow obi tied around her waist. Underneath her standard Shinigami captain's uniform, Soifon wears the uniform of the Commander-in-chief of the Onmitsukidō, which has no sleeves and doesn't cover the back. Her hair is worn short with two long braids covered in cloth. Prior to Yoruichi's defection, Soifon's hair was shoulder-length and had a softer look to it (perhaps relating to her change in personality). Instead of wearing the standard Shinigami sandals with tabi, she wears traditional Chinese shoes with ordinary white socks.
Soifon is staunchly loyal, firm, and unbending in her beliefs. She is a hard worker and takes a strong moral stance — she particularly believes in following orders. She is generally reserved and truly not arrogant in any manner like her lieutenant. She will not hesitate in the slightest to strike down even her subordinates if they stand in her way. She chooses to ignore all her subordinates, including her lieutenant Ōmaeda, believing that personal struggle builds character. Soifon, like most female Shinigami, is a member of the Shinigami Women's Association, and appears to be the only one of captain rank within the organization (assuming Retsu Unohana is not a member).
Soifon likes fish, but dislikes meat. She often spends her free time dreaming about the days when she and Yoruichi fought together and practiced Shunpō. In a Valentine's Day omake, she even tried to give her a heart shaped box of chocolates with little success and she seems to love anything that resembles a black cat, which is Yoruichi's alternate form, and she has a large collection of black cat shaped merchandise. It is also known that since Yoruichi's reappearance, she began to collect cat accessories and had the 2nd Division quarters installed with floor-heating (the expenses were covered by her lieutenant). Soifon once seems to be affectionately admiring pictures of Yoruichi. Later, as part of the photo collecting project of the Shinigami Woman's Association she attempts to take nude photos of Yoruichi while she is distracted but fails miserably. During a meeting of the Shinigami Women's Association, she requested to have a cellphone in the shape of a black cat's head with a bee body (the cat representing Yoruichi and the bee representing herself) that would allow her to talk to Yoruichi as much as she wants, and in another meeting when discussing ideas for a Shinigami video game, Soifon requested a game with her and Yoruichi as the protagonists, both requests were denied however. Soifon's name means broken (or rather, to break) bee and the name of her zanpakutō, Suzumebachi, means hornet.
Soifon is a person of incredible resolve, not hesitating to do whatever it takes to complete a mission and defeat her enemy; an example of this can be seen during her battle with the Segunda Espada, after being exposed to an attack she orders her vice-captain to remove her arm without hesitation. Very rarely will Soifon show signs of desperation or emotion on the battlefield, except when it concerns her former master. Despite her cold demeanor and constant attack towards her vice-captain, she has displayed a certain level of faith in him (trusting him to act as a distraction while she carries out a plan).