There is nothing else known about Master Porcupine other than that he was possibly among the first of Oogway's students trained in Kung Fu and that he apparently passed away into the Spirit Realm a hundred years prior to the events of Kung Fu Panda 3.
After having his Chi taken by Kai upon arrival, Porcupine was resurrected as a Jade soldier and used alongside the Badger Twins to find Oogway's students and bring them to the yak when he returned to the Mortal Realm. He fought hard against Po, the Furious Five, and Shifu in the Valley of Peace. During the fight, Po and the others remarked on how Porcupine and the Badgers were made of jade, Po going so far as to seize Porcupine in the middle of their fight and ask a startled bystander pig to take a sketch of them together, which Porcupine stopped by kicking at Po and throwing him through the ceiling of Mr. Ping's Noodle Shop and into Po's old room, where brought out his nearby action figure of the unjaded Porcupine while being strangled. Porcupine and the Badgers were kept at bay by Po's rapid "Dumplings of Doom" technique, which distracted them long enough for him the Five and Shifu to pin them down. However, Kai spoke through the jade beings and summoned them away, causing them to disappear as quickly as they had appeared. Not long after, when Kai found the Panda Village, he unleashed all of his jade warriors, including Porcupine, upon the pandas and those with them. The pandas, however, got the upper hand through the battle, so Kai retracted him and the rest of his minions.
It is presumed that once Po successfully vanquished Kai in the Spirit Realm by overloading with Chi, Porcupine and the other enslaved masters were returned to normal when they had the left over Chi given to them by the panda himself and left to rest in peace.