Serin was a female Twi'lek who belonged to the early Free Ryloth Movement not long after the Galactic Empire was formed. After the rebel group made a purchase and were collecting weapons, she, along with Gobi Glie and Hera Syndulla, were tracked and then apprehended by Imperial forces under the command of Vice Admiral Rampart. This led Cham and Eleni Syndulla to launch a rescue mission. Nevertheless, the Empire quickly took her and the others back into custody, although Clone Force 99 ultimately saved them.
Serin's debut was in "Devil's Deal", the eleventh episode of the animated series Star Wars: The Bad Batch, which is available on Disney+. Her voice was provided by VyVy Nguyen.