Brayl

"One of the major flaws with the R5 is its personality matrix (which IA cut corners on during the design stage). Frequent memory wipes and regular maintenance will keep them running and prevent them from becoming—and I know this sounds weird—bitter. My R5 actually gets kind of grumpy if I'm late giving him an oil bath."

―Brayl

Brayl was a spacer during the Galactic Civil War. Brayl owned an R5-series astromech droid which was known to get grumpy if it didn't get a regular oil bath.

Sources

• Cynabar's Fantastic Technology: Droids (First mentioned)