Haru

History
Haru is a young Earthbender, whose Earth Kingdom village was occupied by the Fire Nation. Seizing the village's coal mines to fuel their ships, they extracted exorbitant taxes from the citizenry, and most cruelly, took all known Earthbenders to a prison shipyard, Haru's father Tyro among them. To ensure his safety, Haru's mother forbade him from earthbending (although he continued to earthbend in secret).

One day, as he was practicing alone, Aang and his friends stumbled upon Haru. While Haru and Katara struck up a kinship over shared parental losses, they came upon a villager trapped under a rockslide. Haru aided him through Earthbending, but the old man reported him even though his life was saved, and he was taken into custody.

Aang and Sokka then helped engineer Katara's false arrest for Earthbending, so she would be taken to the shipyard. There they and Haru helped stir up a mass prison rebellion and escape. Reunited with his father, and reinforced by fellow Earthbenders, Haru now has a chance of driving the Fire Nation from his home.