K-5, sometimes called Kay-Five or simply five, was a K droid created by the droid J-6 on the planet Aricho. K-5, like the other K droids, was intended to help the resistance fight to free Aricho from the Nihil pirates. Upon her arrival on Aricho, Jedi Knight Vernestra Rwoh helped J-6 prepare the K droids for combat, even adding an additional arm to the center of K-5's chassis. K-5, together with the other K droids, participated in the rescue of people being held at a processing facility by the Nihil.