Pu-on Tim was an acclaimed Earth Kingdom playwright. He was best known for his play based on the life of the Avatar: The Boy in the Iceberg, which is considered to be his seminal work.
He scoured the globe gathering information on the Avatar, from the icy South Pole to the heart of Ba Sing Se. His sources included "singing nomads, pirates, prisoners of war, and a surprisingly knowledgeable merchant of cabbage".
Writing The Boy in the Iceberg almost drove Pu-on Tim insane. He spent weeks at a time on the road, staying up for days, researching leads, and following the Avatar. He literally had hundreds of scrolls filled with notes about the Avatar. It was as if he had managed to talk to every person with whom the Avatar had come in contact.
Pu-on Tim often described the experience of following the Avatar as a painful and blurry dream. However, in the end, Pu-on Tim could not have been happier with his unbiased view of the Avatar and his companions. He called The Boy in the Iceberg his "masterpiece". Sadly, other critics were less kind about the play, calling it merely "watchable".
Pu-on Tim's name consists of two parts: "Pu" (浦 ), is a Chinese surname meaning "beach", and is one of the Hundred Family Surnames. On-tim (安添), his given name, roughly reads as "increasing peace". The character 安 is also used in Aang's name. His name exclusively uses the Cantonese readings of the characters.
Pu-on Tim is named after Avatar writer Tim Hedrick, as a humorous play on the words "poo on Tim". His appearance is also modeled off of Hedrick.
The ending to The Boy in the Iceberg, in which the Fire Nation gained total victory in the Hundred Year War, was especially odd considering the playwright was from the Earth Kingdom.