Pong

"earth"

- Shh, listen, you can’t mention the war here, and whatever you do, stay away from the Dai Li.

Pong is a minor government official who had recently moved in the Upper Ring of Ba Sing Se by the events of City of Walls and Secrets and was occupying the house across from Aang, Katara, Sokka, and Toph rented house.

History
When Sokka asked him questions about the war, he seemed hesitant. When asked to explain why he was nervous talking to them, he stated that he didn't want to get in trouble, most likely with the Dai Li. He warns Aang and his friends to not mention the war within the walls, and to look out for the Dai Li and to stay away from them. Pong hasn't been seen since, and his current status isn't known after the invasion of the Fire Nation.

In the DVD commentary for "City of Walls and Secrets", the creators said that they had initially intended for Pong to have a much larger role (supposedly comical) that would stretch to the end of the season, but that he got written out in subsequent revisions.