Soifon is staunchly loyal, firm, and unbending in her beliefs. She is a hard worker and takes a strong moral stand — 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 Omaeda, 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; it is noted that the name of her Zanpakutō, Suzumebachi, means hornet.