Deethree-Ohnine, alternatively written as D3-O9, was a droid in service on the Star Cruiser named Halcyon. Constructed by the originator of Chandrila Star Line many centuries before the First Order-Resistance War, D3's main function on the Halcyon involved overseeing the ship's logistical operations. In addition, she interacted with passengers of the Halcyon using the droid communication system found in the suites and cabins.
D3-O9 is a character that was designed specifically for the Star Wars: Galactic Starcruiser interactive adventure at Walt Disney World Resort. Her initial reveal, including design sketches, occurred on StarWars.com on November 17, 2021. She acted as a digital assistant, enabling guests to communicate with her via screens located in their staterooms.