Nire is a young woman with magenta eyes and chest-length auburn hair that is tied in a ponytail with a pink scrunchie to the left side of her head, with the rest of the hair loose.
She wears a standard operator uniform but without a tie. When off duty, she wears a light pink t-shirt under a black track jacket with pink outlines and two thin stripes on the side of the sleeves. She also wears a matching black track pants and shown going barefoot while inside her unit's Operation Room.
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Boy, You can't do anything without me!
- "Hikari" (光? ) literally means "light", while "Nire" (an alternative reading of 仁礼 Nirei? ) means "kindness, courtesy".
- She likes manga, animals, shopping, and idling about.
- Without her permission, one cannot enter her kotatsu (in the operation room).
- Her voice actress, Yurie Kobori, also voices Futatsugi and Mira.