Yon Rha

Yon Rha is the former commander of the Southern Raiders. When Katara was a little girl, Yon Rha's unit attacked the Southern Water Tribe, looking for a rumored Waterbender. Yon Rha interrogated Kya, trying to find the Waterbender's identity. Katara found the two of them, and Kya told her to run away. When Katara left, Kya promised to tell him the Waterbender's identity if he left the Southern tribe in peace. Yon Rha agreed, and Kya told him that she was the Waterbender. The told him that she was willing to go to prison, but Yon Rha said he was not taking prisoners. He then killed her.

Yon Rha retired, and went to live with his elderly mother. Katara finds him, and confronts him about the murder. Though she cannot forgive him, she lets him live, and leaves.