The individual acting as a monitor for First Order General Armitage Hux (a human) was present on the bridge of the Star Destroyer called Finalizer as the Battle of D'Qar unfolded. This person received the communication from Poe Dameron when the pilot attempted to reach Hux from his ship, Black One. The cuff-title displaying "Ro" on their left arm indicated that they held the rank of sergeant.
Kate Dickie played this character in the film Star Wars: Episode VIII The Last Jedi.