Nijimura is the Higashikata family's housekeeper. She is eventually revealed to be the daughter of Holly Joestar-Kira and thus Yoshikage Kira's younger sister. Kei is a Stand user who wields the autonomous, chilling Stand, Born This Way.
Nijimura is a young woman with long, dark hair which is normally tied in a bun with the exception of her meeting with Josuke with her hair down. She wears a maid's uniform consisting of a dark blouse with an apron. Her apron is decorated with two pins that resemble lightning bolts and the letters "GU", which likely stands for her Stand's original name, Going Underground, on each pin, and pantyhose patterned with stars. She wears a chin-strapped dark-colored hat that is also decorated with the letters "GU", and each of her shoes is designed with a bow knot.
When confronted by Josuke, it is revealed that she bears a joestar birthmark near her left shoulder.
