Nobot (Earth-2042)

"Nobot," also known as "Ghost Droid," was a 3PO-series protocol droid that constantly walked the streets of Mos Espa, Tatooine. The droid appeared to have no aim or function as it wandered across the desert wasteland of Tatooine, and the only thing truly known about it was that it was a resilient unit—despite its travels, it would always find its way back to Mos Espa. The droid became the subject of several tales and anecdotes, most notably from the aging marketplace vendor Jira.

Source

 * https://starwars.fandom.com/wiki/Nobot