Nanao is a youthful girl with black hair normally kept pinned back, she has blue eyes and wears glasses. She notably resembles Lisa Yadōmaru, a member of the Vizards and the person who preceded her position as the 8th Division Lieutenant. The resemblance is likely intentional on her part, as she is hinted to have greatly respected Lisa before she became a Vizard, when Nanao was a child first joining the Gotei 13.
She is a very serious and pragmatic person who often puts up with her captain's silly antics, but like all lieutenants, she is extremely respectful of her captain and follows his instructions without hesitation. She is almost always carrying a heavy book. Nanao is often accosted by her captain, whose teasing takes various forms. Nanao's usual reaction is to scold him or hit him with something, usually a fan. When she is particularly annoyed she takes off her glasses, though her face has never been seen while doing so. Apparently this act is quite frightening, as most people who see it are reduced to gibbering wrecks just by witnessing it, even the sadistic cold hearted 12th Division captain Mayuri Kurotsuchi fell victim to this intimidating spectacle.
In her free time, she likes to go shopping, but even more to read, and often visits the library. She is in good terms with fellow reader Momo Hinamori, she even brought her books during her hospitalization. Nanao also has an article serialization in Seireitei Communication, titled "Please be Moderate", which is very popular, especially among the male readers. Nanao is known to be an excellent calculator, a skill very handy, given that she has to do even most of her captain's paperwork. Her favorite food is sweet bean jelly, and she does not like powdered green tea, a trait which is interestingly shared with her captain.
Kidō Expert: It is later revealed in Kubo's cliff notes on the sides of omake chapters that just like Momo Hinamori, Nanao is also a Kidō master.
Flash Steps Expert: Nanao is proficient enough in flash steps to keep up with most lieutenant-level Shinigami.
High Spiritual Energy: Being a lieutenant of the Gotei 13, Nanao boasts a high spiritual energy.