Nanami has short dark brown hair, part of it being held on the right side of her head by a pink hairband, and green-brownish eyes. She wears the standard female Hyakkaou Private Academy school uniform which consist of a red blazer with black trim on the cuffs and around the neck, and is decorated with gold buttons that is complete with a black tie. She wears a gray colored skirt with patterns on it, black colored panty hose, and brown loafers with black soles.
She used to have very long, and wavy hair, but it was cut by Jun Kiwatari and his group, when they decided to bully her due to her status of being a housepet.
At the beginning, Nanami is shown to be quiet, shy, and quite anxious person. She is terrified of Jun Kiwatari to the point where she's completely subordinated to him, being willed to lose her chance of paying her debt, and thereby regaining her status of normal student, and still being a housepet instead.
After meeting Yumeko Jabami, who convinced her that her submissiveness to unreasonable people like Jun is wrong, Nanami's personality has changed. She regained will of fighting for her own good, and stopped feels anger, sadness and dismay, while still being a nice and kind person.
Kakegurui - Compulsive Gambler
She was first seen during the Indian Poker game, organized by the committee, to help housepets lower their debts. During the game, she didn't do much at first. Due to the fact, that Jun was the bully who cut her hair once, she was giving him sings, which cards she had. When Yumeko find out about their trick, she told Nanami to ditch Jun, unless she wants to continue being treated like this to the end of her life. Eventually she decided to go for the win herself. However, she didn't end up winning, as Yumeko only used her to mess with Jun. But Nanami's debt was still lowered and she gained a lot of confidence.