- "Must protect... Must fight..."
- —P-33 while battling Nier.
It is shown on subsequent playthroughs that P-33 was a military robot programmed to stop intruders in the robot factory. Upon finding the young shade Kalil, his first intention was to destroy him, but he reconsidered after learning of Kalil's situation and vowed to protect him. Over the years Kalil and P-33 became good friends. Kalil taught him many things about the outside world and soon the two decided that it may be fun to finally venture out of the Junk Heap and explore the world. It is at this time that Nier and party arrive and promptly destroy them, mistakenly believing that they are the murderers of Gideon's brother, Jakob.
P-33 makes an appearance in the Novella called The Fire of Prometheus, apparently surviving his encounter with Nier.
- According to P-33, his creator died 874 years, 10 months, 14 days, 4 hours, and 43 minutes before meeting Kalil.
- P-33 makes another appearance in the novella written by Yoko Taro called "The Fire of Prometheus" which was published in the DOD3 Complete Guide.
- The "P" is meant to reference the main protagonist Pinocchio from The Adventures of Pinocchio.
- P-33 is mentioned in NieR: Automata, when playing as 9S and visiting the Factory. It is stated that P-33's were manufactured there.
- "The Fire of Prometheus" tells how P-33 gained massive intelligence and then broke free from the Junk Heap, launching himself into space. As he was leaving he saw the alien's machines fighting an endless war. He decided to give them the gift of intelligence. This is referenced in the Nier: Automata Picture Book "Spirit of Fire" that can be found in-game in the Intel section.