Just a lil description of the Fire Sibs
Prince Zuko has this amazing redemption arc and despite being this angsty ball of an honor seeking teen, he really is a dork who is just doing the best he can. He looks like he runs off of nothing but energy drinks and spite in Book 1 and by the time he gets to Book 3 He's looks like the person who shows up with a cup of black coffee in his hands and goes, "Alright. Let's get this over with." but still throws away the Coffee before his Uncle spots it because how dare his family drink coffee instead of tea.
Azula on the Other hand is this little fourteen year old who is such a perfectionist that you ache for her. Especially in those final moments because she is indeed just a kid. Her introduction is absolutely amazing as not only does it show how intimidating she is and calculated, but it also shows her immediate weakness of the idea that merely because she wills it, they must ignore the dangers of the tides of the seas to please her.