Azula, is the insanely cruel and horrendously vile daughter of Ozai. She fought her brother, lost then was shipped to a Fire Nation insane asylum. For most of the series, she was followed around by her two bitches, Mai and Ty Lee, forming the group known as The League of Evil Bitches. She likes using blue Fire instead of orange fire because she's too good for regular stuff.
Her father told her to destroy Zuko and Iroh, so she turned into the Evil Queen of Unspeakably Horrible Deeds and also went after the the Avatar. Her dumbass brother attempted to deafeat her, but Katara pwned her.
Azula is also named after a man. Not sure how that works, lol.