I have seen evil and her name is Azula

          So from the very beginning of this series you knew that the Fire Nation was the villain. More specifically the Fire Lord who was the ruler of the Fire Nation was the bad one. He, like his ancestors took advantage of the Avatar's disappearance and dispatched his army across the other nations in order to try to take over the world. His son prince Zuko was also seen as a bad guy at first. Determined to follow in his father's footsteps he  made a vow to capture the Avatar-the world's only hope and bring him to his father so that his father could restore his honor.

          An angry and fearsome looking firebender he indeed caused fear in many however, he was not the villain in this series. Not even his powerful ruthless father the Fire Lord who stole the crown from his brother was the evil one. No, the character who caused chills to run down my spine-the one whom me and my brother vowed we would never cross paths with if we lived in this fantasy world was the essence of pure evil. Her name was Azula and she was the Zuko's little sister and the princess of the Fire Nation

          I think she was the the world's greatest threat. She might have been beautiful, graceful, and behaved like a spoiled princess on the outside but do not let that fool you. I'm telling you the only person that did not fear her was her father and I think that is only because her father was the only one she would never lay a finger on. Princess Azula was cunning, manipulative, merciless, and a very, very powerful firebender. She would quickly assert herself over anyone who crossed her path and had no qualms about turning against any member of her family (except for the fire lord of course).
          Though she was the little sister she would overpower Zuko. She would take anything she wanted by force, destroy her friends' lives if that is what it took for them to help her and enjoyed watching people suffer. She definitely enjoyed watching her brother get that scar on his face and she even attacked Uncle Iroh in an episode. I mean it's Uncle! If that does not prove that she is evil then I do not know what else would. I think I would have rather faced a hundred Unagi and Saber-toothed Moose Lions than face her. Whenever, she would appear in an episode my little brother and I would groan because we knew that things were going to end badly. She never repented or regretted any of the the things she did, not even at the end when she was finally defeated which is further proof that she was the real threat.