Ho Tun

Ho-Tun was a student at the Bei Fong Metalbending Academy. One of Toph's three students, he was a nervous type who was constantly worrying about doom, as well as his parents, who lived in Yu Dao.

Trivia

 * Gene Yang was originally going to have Ho-Tun constantly obsessing over death, but the idea was deemed inappropriate by Nickelodeon for the target age group. Therefor, Gene replaced it with an obsession with "doom", leading to a more comedic effect.