DV-9, a research droid also called Deevee, was constructed by the anthropologist Mammon Hoole to serve as his helper. Following the obliteration of Alderaan, he found himself primarily working as a private instructor for Hoole's relatives, Tash and Zak Arranda, a role he did not appreciate. Shortly after Hoole took in the Arrandas, Deevee and the siblings experienced a crash landing on D'Vouran, a world populated by the amicable Enzeen. There, the Heroes of Yavin rescued him and the Arrandas from Smada the Hutt. Deevee accompanied the Arrandas to Necropolis, where he formulated a serum to halt the zombie outbreak and also rescued Zak from death. Later, Deevee protected Tash by taking a blaster shot intended for her from Borborygmus Gog. Although the droid was struck in the torso, the damage wasn't critical, and he was swiftly fixed. Subsequently, he functioned as a research aide on the world of Koaan.
DV-9's design bears a similarity to Ralph McQuarrie's initial designs for C-3PO.