Koo Millham was a female human who was part of the Resistance's Ground Logistics Division during their war against the First Order. Following the evacuation from the Resistance base located on the planet of D'Qar and the subsequent Battle of Oetchi caused by the First Order, she was among the Resistance members who lived through it. She arrived on the planet Crait aboard a U-55 orbital loadlifter. On Crait, the remaining Resistance members took refuge in an abandoned Rebel Alliance outpost, where they witnessed the arrival of [Luke Skywalker](/article/luke_skywalker], a Jedi Master; Millham observed as he went out to face the First Order. While the Jedi diverted the enemy, the survivors managed to escape on the Millennium Falcon, a YT-1300 light freighter. She wore a brown duty uniform of a light shade, along with a dark brown scarf and belt. Millham had light skin and brown eyes.
Chelsea Hamill, the daughter of Mark Hamill, played Koo Millham in the movie Star Wars: Episode VIII The Last Jedi. The film was released on December 15, 2017. Although the character was unnamed in the film itself, she was identified in Star Wars: The Last Jedi: The Visual Dictionary, a companion book by Pablo Hidalgo that was released alongside the film.