Years later, a female Nami leader named Ali Tarrak came to power. Forces under her command captured a prototype of the new TIE Defender starfighter produced by the Galactic Empire, and very nearly precipitated an arms race by attempting to sell that technology to the Rebels. Eventually she was captured and sent to Coruscant, where she would be trained to serve the Emperor. Deprived of their production centers and their leader, the Nami species sank back into obscurity.
The Nami are likely to be Human sized, if not Humans themselves, as they can comfortably fly TIE Defenders produced exactly to Human pilots' standards. Tarrak's voice over the radio commlink during the prototype capture conflict sound very Human and accentless.