Hama

Hama is the main antagonist in the Season 3 episode "The Puppetmaster" in Avatar: The Last Airbender.

Character description and Behavior
Hama was a Waterbender that came from the Southern Water Tribe and was taken captive by the Fire Nation seventy-five years ago. She discovered her waterbending increased during a full moon and began to bend the water in the jail rats and later a Fire Nation man whom she forced to unlock her cage. She posed as a harmless old woman to Katara and secretly used bloodbending on the village people. She then forced her to bloodbend by trying to kill Aang and Sokka and Katara saves them. Toph later frees the villagers that were locked up in the mountain, and then arrests her. She then proclaims her work to be done and congratulates Katara and calls her a Bloodbender and is walked out laughing maniacally.