Uni is the human form of Black Sister and one of the new main characters in Hyperdimension Neptunia mk2. The younger sister of Noire, Uni goes to help her sister along with the others to save the world.

Uni seems to be friendlier than Noire is, and befriends Nepgear quickly in the game until learning of her relation to Neptune. However, she is still very much a tsundere.

Uni fights with a big long range assault rifle.