A droid was in service to the newly-christened Sith Lord, Darth Vader aboard his starship in 19 BBY.
Darth Vader's droid first appeared, albeit unnamed, in Darth Vader (2017) 2, a 2017 canon comic written by Charles Soule and penciled by Giuseppe Camuncoli.
Darth Vader's droid first appeared, albeit unnamed, in Darth Vader (2017) 2, a 2017 canon comic written by Charles Soule and penciled by Giuseppe Camuncoli.