Azula

One of the most skilled firebenders of her time, recognized as a prodigy. She is the dangerously unstable princess of the Fire Nation, daughter of Fire Lord Ozai and Queen Ursa, younger sister of Zuko, and the archenemy of Team Avatar as a whole. She believes that power and domination are what makes a person strong. She has absolute confidence in her "divine right to rule" which she believes she was born with. She has neither pity nor mercy toward those she marked as treasonous or inferior.