Uni is a recurring character in the Neptunia video game series, and one of the main protagonists of Hyperdimension Neptunia mk2. She is the human form of Black Sister and the younger sister of Noire. An insecure girl who desires to be as strong as her sister, Uni ends up befriending Nepgear and eventually joins her on her quest to rescue the kidnapped CPUs.
She is voiced by Eri Kitamura in the Japanese version and Sarah Williams in the English version, both of whom also voice Sayaka Miki.