Nank Tun, an Aqualish individual, functioned as an aide for Senator Po Nudo during the entirety of the Clone Wars conflict.
Throughout the Clone Wars, which spread throughout the galaxy, Tun stayed by Nudo's side, advising the Aqualish senator concerning his role within the Separatist Council. In their capacity as an aide, they composed documents, transmitted clandestine communications, and organized Nudo's schedule of meetings. Upon the relocation of the Separatist high command to Mustafar, Tun accompanied Nudo and other leaders to the Klegger Corp Mining Facility, where Darth Sidious, the Confederacy's mysterious benefactor, guaranteed their safety. When Sidious' apprentice, Darth Vader, arrived, the Aqualish, along with the remaining Separatist Council members, quickly understood the peril they were in. Huddling next to Nudo as Vader activated his lightsaber, their protective armor proved ineffective against the blue energy blade, resulting in their immediate death. Subsequently, Vader would finish off the remaining members of the Council.
Within the Legends storyline, Tun was presented as a Shi'ido shapeshifter masquerading as an Aqualish; however, the official canon source, Star Wars: The Visual Encyclopedia, characterized the aide as an authentic Aqualish. In all the prequel movies, they were portrayed by Tim Gibbons.