N-4PO, existing in the final period of the Galactic Republic, was a protocol droid.
N-4PO's home was in the droid colony situated in the city of X2-4 found on the moon called Uffel; there, he functioned as the chief administrator for Uffel Research and Development. Around 31 BBY, he came across the Heroes of Cularin upon their arrival to Uffel, subsequently delegating the astromech droid R6-D6 to address their various needs and questions.
As the Clone Wars unfolded, the Thaereian military triggered specific defense programs within some of Uffel's droid population. This caused them to desire to combat organic lifeforms in an attempt to safeguard Uffel's droids, and N-4PO rose to be a prominent figure among these rebellious droids. Soon after, he met the Heroes of Cularin once again, when they journeyed to Uffel to look into the Thaereian actions taking place on the moon.