Corncob guy

Corncob guy was a resident of Ba Sing Se who used the monorail to travel from one place to the other. Many people found him odd, as he was often found sucking on a corncob with a rather strange expression on his face.

History
Once, while riding on the Ba Sing Se monorail, he encountered Team Avatar. Ironically due to his seemingly odd personality, he showed up just as Sokka was telling the rest of Team Avatar how "weird stuff [happened] to [them]". His sudden presence roused a surprised reaction from the group as he unceremoniously wedged himself in the seat between Sokka and Toph, all the while sucking on a corncob.

Trivia

 * The corncob guy was drawn by Chris Graham in the storyboard as a homage to a similar joke in Invader Zim, a series that he and Bryan Konietzko worked on together.