K-2SO

https://starwars.fandom.com/en/wiki/K-2SO 

K-2SO is the droid guard of the KX series originally created for the armed forces of the Galactic Empire. Like all droids it could function in a vacuum (in outer space).

At some point the droid joined Captain Cassian Andor a member of the Alliance for the Restoration of the Republic a rebel movement seeking to overthrow the Empire and restore democracy. Andor managed to reprogram K-2SO as a strategic planning specialist for the Alliance service.

Together with the rebel group K-2SO he participated in the mission of stealing the drawings of the Imperial Battle Station the Death Star. During the mission Kay-Tu was destroyed by the Empire’s attack aircraft when he covered Cassian Andor and Jean Erso who were looking for a data carrier with drawings in the Citadel.