DJ (shortened for Don't Join) is a supporting antagonist in the 2017 film Star Wars: Episode VIII - The Last Jedi, the second film of the Star Wars sequel trilogy. He also appeared as the titular protagonist villain of the 2018 comic called Star Wars Most Wanted: DJ.
He is a code breaker who found himself stuck in prison on Cantonica. At first, he seemed friendly to Finn and Rose and helped them get inside the First Order flagship, but later in the film, he saves his own skin by selling them out to Captain Phasma.