Azula

Azula is the princess of the Fire Nation, daughter of Fire Lord Ozai and Ursa and younger sister of Zuko. She was a key adversary of Team Avatar chasing Avatar Aang and her banished brother far across the Earth Kingdom accompanied by her then two best friends, Mai and Ty Lee. A firebending prodigy, Azula is manipulative and obsessed with power. She was a skilled strategist who orchestrated the coup of the Earth Kingdom