D-O is a small, wheel-based droid introduced in the Star Wars franchise. Known for its cylindrical body and singular wheel, D-O is a quirky and enthusiastic droid that accompanies the Resistance in their battle against the First Order. Originally belonging to a Sith hunter named Ochi, D-O is later found and repaired by the Resistance. The droid quickly becomes attached to the main group of characters, providing valuable assistance with its database of knowledge and communication skills, despite being somewhat timid and reserved.