Counterpart

A counterpart was one of a group of two or more droids who had been together for a long time and could function together at around 30-35% better than normal droids.

Such connections could also form between droids and regular computers. By 9 ABY, the computer of Luke Skywalker's personal X-Wing had molded itself to R2-D2's unique personality, allowing R2 to work on the ship with counterpart level efficiency. However, this also meant that the standardized diagnostic equipment used by New Republic technicians was ineffective, making it impossible to do systems maintenance without R2's assistance. Due to this issue, it was standard procedure to give astromechs regular memory wipes, which Skywalker adamantly refused to do.

Examples of counterpart pairs included R2-D2 and C-3PO.

Text and facts from the “Counterpart/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.