[4][5] At the beginning of the series, she becomes the caretaker of the fairy Mepple, who is from the Garden of Light, and gains the power to transform into Cure Black (キュアブラック, Kyua Burakku).

[8] Nagisa is a 14/15-year-old teenage girl with fair skin, dark ginger hair, and hazel eyes.

She usually wears Verone Academy's female school uniform, which consists of a red blazer worn over a dark red shirt with a white undershirt, a blue striped bow, and a teal plaid skirt, along with black socks and brown loafers.

Nagisa's Card Commune, in addition to housing her fairy mascot Mepple, grants her powers as a Pretty Cure.

In the English dub of Futari wa Pretty Cure, Nagisa's name is changed to Natalie Blackstone, and she is voiced by Rocio Barahona.