Fat was a swordsman who served as Piandao's loyal, yet disgruntled butler. A serious man, Fat did not find many things humorous. He prepared meals and beverages for Piandao and his students, whom he also assisted in training. He seemed to enjoy order and cleanliness.
Fat came to Piandao many years ago and proved his worth by cooking him a delicious dinner. Piandao trained Fat in exchange for some good, home-cooked grub, and the two have been together at Piandao's castle ever since.
When Sokka showed up at Piandao's door step, Fat let the boy in, seeming to be very bored and annoyed. Fat later became very upset when Sokka destroyed his rock garden during a lesson. Although Fat bested Sokka several times when they were sparring, he was finally beaten when Sokka completed his training. When Sokka brought a meteorite to use as the metal for a sword, Fat helped Sokka break it up into manageable pieces in order to forge his very own sword.
When Sokka and his group were leaving, Fat stopped them just outside the castle gate, saying that Piandao had sent him a gift to remember him by. He handed Sokka some leaves and a small sack, inside of which was a white lotusPai Sho tile.