The Baby of the Bunch: The youngest of the Gaang, as a result of spending one extra year in the iceberg in this AU.
Berserk Button: Betrayal. Aang literally summoned a volcanic eruption following Mai's Face–Heel Turn, and when he thought that Ty Lee was a turncoat airbender, he was ready to pummel her.
Break the Cutie: When Mai reveals her true loyalties in Chapter 16. Fortunately, she realizes who her true allies are shortly afterwards.
Taking You with Me: Injured and outnumbered by Mai and Zuko on Crescent Island, Aang goes into the Avatar State and decides to explode the island. Mai snaps him out of it by completing her Heel–Face Turn.
Mai
Becoming the Mask: Grows to genuinely care for Aang, Sokka and Katara.
Deadpan Snarker: Enduring the stress of finding out where her loyalties lie turns Mai's emotionless sarcasm up to eleven.
Face–Heel Turn: Was initially planning on betraying Aang and Sokka during the first arc, but realized that her loyalties had changed after her first wave of Character Development.
Heel–Face Turn: Her allegiance to Team Avatar is solidified by her own accord at the end of the first arc (Chapters 17 and 18).
Tempting Fate: When the firebenders on her ship are melting the iceberg where Aang is, she notices that there’s not much visible melting, and they’ll probably be at it for a while.
As typical proof of the universe’s arbitrary nature, Mai had no sooner stepped out onto the extended glacier than the iceball exploded in a shower of steam and light.
Sokka
Back from the Dead: Is resurrected by Spirit Water in Chapter 75, after being fatally wounded by spirits.
Big Brother Instinct: Gives maximum effort to free his little sister from the waterbender prison.
Deadpan Snarker: Has a sarcastic and cynical wit. A tad bit more bitter than his canon counterpart due to the greater hardships he has endured in this AU.
Disney Death: Is killed by malevolent spirits at the start of Chapter 75, but is revived by his sister's bloodbending, with the help of a little spirit water.
Heroic Sacrifice: Dies by leading the corrupted spirits away from his friends in Chapter 75.
I Will Find You: Even after 10 years of separation, Sokka holds it as his duty to find out what happened to Katara, and to rescue her if she's still alive.
My Greatest Failure: Standing like a Deer in the Headlights while his parents were murdered and his little sister was taken away by Fire Nation soldiers. Not that it's his fault in any way - he was only 6 at the time.
Katara
Barefoot Captives: Dressed in rags and bare feet while in the waterbender prison.
Break the Cutie: Averted. Though she may have spent 10 years in the waterbender prison, the older waterbenders - particularly Hama - looked after her as best they could, even though they were all in separate cages the whole time.
Although it's Played With to some extent. While Katara is still cheerful and idealistic, she has developed a phobia of open spaces and is uncomfortable around huge crowds of strangers. And during her few moments of severe anger, she can think and say some pretty dark and cruel things.
Children Are Innocent: Most notably in Chapter 18, where she encourages the rest of the Gaang to forgive Mai.
Determinator: Ready to join the resistance right after she escapes from the waterbender prison. A bigger example takes place in Chapter 75, where she revives her brother's corpse with spirit water.
Eye-Obscuring Hat: Wears one following her escape from prison to cope with her agoraphobia.
Heroic BSoD: Being inside locations that remind her of the waterbender prison (hot, dry, metallic, glowing in the dark) causes her to panic.
Heroic Sacrifice: Reveals herself as a waterbender to Fire Nation soldiers in order to try and get them to spare her family. What makes it more significant is that she was 5 years old at the time. It didn't go well.
Heroic Second Wind: While the older waterbender prisoners quickly lose their strength during the prison breakout, Katara is able to hold onto consciousness long enough to push the escape boat to safety.
Icy Blue Eyes: Played With in Chapter 73. The Fire Nation soldiers who witness her bloodbending in action stare at her in terror, seeing vengeance in her eyes. But from Katara's point of view, she's staring at them with the eyes of the little girl who the Fire Nation had tried to cruelly lock up forever.
I Did What I Had to Do: Katara uses bloodbending to first escape from Pakku in Chapter 50, and then to hold back an overwhelming number of Fire Nation soldiers in Chapter 73. She's not proud of it, but knows that it has to be done.
Innocent Blue Eyes: Which reflects her kindhearted and optimistic personality. Sokka finding her in the prison with bloodshot eyes is symbolic of the torture she was put through.
Played With in Chapter 73. After a fearsome display of bloodbending, Katara stares at some Fire Nation soldiers who are still standing. She's described as staring at them with "the eyes of the little girl their nation had tried to lock away forever". In that moment, Katara's eyes are pretty much both icy and innocent.
Incorruptible Pure Pureness: In contrast to other versions of herself who spend several years in the waterbender prison, this Katara is as idealistic as ever.
Not Used to Freedom: After spending her entire childhood in a small cage, Katara often feels unsafe in new surroundings after being freed. Bloodbending helps her to get over this fear, though.
Power-Strain Blackout: After making extensive use of her waterbending to escape the Waterbender Prison, Katara faints out of exhaustion.
Why Did It Have to Be Snakes?: Develops a fear of the sky due to spending most of her childhood locked up in a cage underground.
Toph
Age Lift: Is older than Aang in this universe, since Aang wasn't unfrozen until after Sozin's Comet.
