K2-SO was an Imperial Security droid reprogramed to serve the Rebel Alliance, and was partnered with Cassian Andor.


How Rogue One Should Have Ended

He first appears right before Jyn and Cassian are about to kiss each other as the Death Star destroys Scarif around them. He flies in with a U-Wing, demanding that the two quickly getting in, before realizing and reacting with surprise towards what they were about to do. He then reveals that he had preemptively copied his memory onto another security droid, and also that Bohdi, Chirrut, and Baze Malbus had survived. After Jyn and Cassian boarded the U-Wing, he remarked that he felt like a 'leaf on the wind' as he attempted to escape.