Due

Due was a waterbender native to the Foggy Swamp Tribe located in the Earth Kingdom. He lived there with his friends and fellow tribesmen, Tho and Huu, as well as the rest of his tribe.

Due did not appear to be particularly intelligent and usually let Tho think for him, but he did seem to deeply value family ties and relationships, since he considered himself and Katara to be "kin" as they were both waterbenders. He even called his catgator, Slim, a member of the family. In general, he was dim-witted but very friendly and worked hard alongside his friends and family to keep them happy and well-fed.

History
While Momo and Appa were separated from Aang, Katara, and Sokka, the animal members of the team encountered Due and Tho, who began hunting them down. Aang eventually found Appa and Momo and stopped Tho and Due, who were more than happy to find fellow waterbenders outside of the swamp in Aang and Katara. Due, Tho, and Huu then invited the team to their camp to share a meal.

Months later, Due, together with his fellow tribesmen Tho and Huu, helped with the initial land stage of the invasion, but remained behind when the invasion force started scaling the volcano. When the eclipse ended, the Fire Nation deployed its airships to the beach to destroy the submarines, the invasion force's only means of escape. The three waterbenders were last seen protecting the subs from being destroyed, but their efforts proved to be in vain. Following the imprisonment of all the adult invaders, Due was placed in a Fire Nation prison with all the other warriors, but he was released along with the other members of the force at the end of the Hundred Year War, and later attended Fire Lord Zuko's coronation.

Trivia

 * Due was one of the few Avatar characters to have underarm hair, the others being King Bumi and The Big Bad Hippo.
 * Due's voice actor, Carlos Alazraqui, also voiced Tho in the original series, followed by Korra's father and a protester in The Legend of Korra.