Accidental Innuendo: "The Drill". Not only is the long stick like drill very phallic in appearance, but when the slurry overflows it looks like a "climax" into the wall.
Alternate Aesop Interpretation: The Great Divide. It seems many viewers focus on the feud between the clans itself and Aang's solution to the conflict. However, from another viewpoint, the episode is a warning about getting caught up in arguments and controversies where there is no clear logical resolution because it's easier to align yourself with one of the groups. Both clans are telling different versions of the same story about a significant ancestor and don't seem to have any sort of evidence or documentation. Sokka and Katara find themselves weighing in on opposite sides of the feud because of which side of the story they heard first, and because of their views on how to adequately build tents in the dry season.
Aang: Really the nice, sweet, compassionate boy with a kind heart that everyone thinks he is, or a selfish brat who damned the world for a century and inconvenienced his friends from time to time to follow his own whims? Was his desire to not kill Ozai in the finale really a sign of just how pure of heart he truly is, or again him being selfish and inconsiderate of the greater good (even if he did manage to get away with it)?
Azula: Sociopathicmanipulative bitch or is she just a product of parental neglect, much like Zuko, but without the benefit of having a loving figure in her life?Word of God seems to lean at least slightly towards the latter though. The creators have stated in interviews that Azula isn't inherently evil and may eventually get better.
And that sooo totally forgives all the various bad things she did.
Ozai: Word of God says he got along very well with Ursa when they first married, which could mean he wasn't always so evil. Conversely, it could say some things about Ursa...
Then again, even Zuko mentions that there "was a time when they were happy" (and visited Ember Island together), so it's likely that he wasn't always evil. This was confirmed eventually in The Promise comics.
Azulon: Considering how little is known about him and how ambiguous a certain scene is, alternate interpretations have cropped up about the order to kill Zuko. Some see it as a sick display of affection and loyalty for his eldest son Iroh, others saw it as a Secret Test of Character that went out of hand, much like Abraham being ordered to sacrifice Isaac in The Bible. It has even been suggested that he never gave any such order- that Azula made it up in order to pick on Zuko, and Ozai went along with the lie in order to gain Ursa's cooperation. More than one Fan Fic has suggested that when Azulon said that Ozai would feel the pain of losing his son, it was because Azulon wanted Zuko to become Iroh's heir.
Koh: Some people see him as a more neutral force, mostly because his one appearance in the series had him helping Aang. Alternatively, he could be seen as a Bigger Bad.
Katara: Good feminist icon in that she's an Action Girl who doesn't disavow her maternal instinct and still embraces her call to Team Mom or bad feminist icon in that she's hyper-emotional (to the point of allowing their entire overall mission to get sidetracked by her just-add-water instant sympathy for random townspeople who, really, will probably be helped out anyway by them rallying to finish overthrowing Ozai) and has that whole "Hell Hath No Fury" thing that leads her to betray her own ideals (in a very definitely bad way) and never really gets called out on it by any other character in the show? Or just an ordinary girl struggling to cope with an extraordinary adventure that she's not prepared for?
Yangchen: The series shares little on her, other than her line to Aang about how the Avatar must sacrifice his own good to that of the world, and the backstory that she was "willing to do anything" to secure peace. Some fans take this and read her as a Knight Templarwho mercilessly slew anyone who got in her way, and called it a "sacrifice" of her own spiritual needs. Others read her as a nun who was truly enlightened, an immense force for good, who was painfully aware of the burdens of being the Avatar.
Toph's Father: After seeing what a powerful Earthbender Toph actually is, as opposed to the helpless little girl he always believed and insisted she was, he still refuses to let her go off on the big adventure training Aang and instead orders that she put under even more security (and she wasn't allowed to leave the estate even before he knew just how powerful she was). When Toph runs away with Aang and the gang anyway, her father hires a pair of wrestlers turned bounty hunters to bring her back, saying Aang kidnapped her. Was he experiencing some understandable Adult Fear, or was he actually more afraid of the damage Toph could inflict on others without anyone supervising her? Maybe a little bit of both? For that matter, did he really believe Aang kidnapped Toph or was he just in denial of the fact that his controlling, domineering ways had finally driven her away?
Ty Lee: Really a sweet, innocent girl who had the rotten luck of being bullied into working for the bad guys, or a Dirty CowardKarma Houdini who knowingly worked for the bad guys believing they were her best bet of survival and then got away with helping to ruin countless innocent lives all the while feeling no guilt for her part in the Fire Nation nearly destroying the rest of the free world?
Mai: Just like Ty Lee, is she a nice girl who had the misfortune of being forced to work with Azula or is she a selfish girl who only cares about herself and Zuko then gets away with crimes like refusing to pay the ransom for her brother?
Zhao: What was his motive for rejecting Zuko's help when he was about to die? Zhao may have realized that, by accepting Zuko's hand, the both of them would have died simultaneously. Another idea is that, in his arrogance, Zhao refused to receive help from his teenaged rival, as he felt that being saved from (what he viewed as) an impatient, talentless, hot-headed and overconfident "child", on top of losing the battle at the Northern Water Tribe, would have disgraced his reputation to the public and his peers, damaged his authority over the Fire Nation military, and prompted a demotion. If this second possibility is true, then through death, as well as the Fire Lord holding the blame for the defeat on the Dragon of the West, Zhao managed to gain a slightly more 'merciful' final fate.
Another interpretation is that, through Zuko's rescue, Zhao felt that he would have owed his life to his rival out of obligation for being saved and may have perceived that as an act of submission. Finally, the last interpretation is that, once the Moon rose again, Zhao realized that his supposed "destiny" of being a legend was indeed false, and without this crutch to explain his own misdeeds, the purpose for his existence fell apart before his eyes. Zuko is a male version of Azula to them.
The interpretation that makes the most sense, given his obsession over history and failures, is that he knew that, if he lived and returned to the Fire Nation, he'd spend the rest of his life in disgrace and humiliation, being scorned and shamed for his massive failed invasion of the North. He'd rather die and at least be remembered for "heroically" sacrificing his life, than become like Zuko.
There's even the possibility that Zhao had a moment of Even Evil Has Standards: despite his dislike of Zuko, Zhao couldn't bring himself to drag Zuko down with him to a possible Fate Worse Than Death for something that, deep down, he knew wasn't Zuko's fault.
The villagers in The Painted Lady: Are they Ungrateful Bastards towards Katara, or are they rightfully pissed that she engaged in cultural appropriation of their main cultural icon, and purely because it suited her purposes to do so at that? Are they possibly both? Either way, they get over it pretty quickly.
Ursa: Loving and devoted mother who was doing her best to raise her children in a poisonous and dangerous environment, or was she as bad as Ozai in terms of favoring Zuko over Azula, which continued to embitter Azula towards her and Zuko?
The Very Nature and Importance of the Avatar: The world's one true hope for "Balance", or an anachronism full of outdated superstitions holding the world back from truly progressing, causing entire societies to stagnate?
Anvilicious: "The Great Divide." The tribes hate each other, and this is a Bad Thing. We get it.
At least they realize this and skip it in the Ember Island play.
"The Painted Lady." Katara's Chronic Hero Syndrome gets dialed up to eleven, to the point the entire episode could be renamed "I will never ever not stop and help people!"
Arc Fatigue: It takes Zuko FOREVER to figure out he should be with the good guys and that the Fire Nation as it stands is a horrible mess that he needs to redeem.
Ass Pull: A lot of people think the finale had two major ones. The first one with Aang being granted energybending is hotly debated as to whether it was an Ass Pull or not. The second with Aang entering the Avatar state by hitting a perfectly-shaped rock so he would not have to let go of Katara is near universally considered a giant one.
Awesome Ego: Toph proclaims herself the greatest Earthbender on the planet - and can back it up.
Suki: When she was introduced, she was a near-unanimous Ensemble Darkhorse. But her joining the Gaang for the final battle split the fandom in half. Some are happy to see her return with more spotlight, others thought that she was just sort of thrown in without much consideration or fanfare and it wound up making her duller. Not to mention she lost her distinctive Kiyoshi Warriors garb.
Broken Base: Aang's conflict in the finale split fans between those who felt it came out of nowhere and those who felt it was perfectly justified given what we'd seen of Aang to that point. Then there's the controversy over whether the resolution of using the previously unseen Energybending so Aang could stop Ozai without killing him was reasonably foreshadowed or a complete Ass Pull. For the record, the creators had the idea of Aang sticking with Thou Shalt Not Kill in their mind from the beginning of the series, they just didn't have anything specific. But the less said the better.
Whether any of the canonical pairings were developed well enough. While most people are tolerant of Sokka/Suki, they continue to be very divided on the way Aang/Katara and Zuko/Mai were written. The reveal that the head writer, Aaron Ehasz wanted Zuko/Katara to happen (but was not allowed to) and the release of the Love It or Hate It comics have only worsened this.
Season 3: Fans either consider it to be the best season of the three or the absolute worst.
The revelation that Roku and Sozin were best friends and that both are Zuko's great-grandfathers. Some fans love it and view it as a good plot twist while others view it unnecessary and the most blatant case of Writers Cannot Do Math (considering the ages both would have to be when they had their kids; considering Rina was Roku's daughter and Ursa was born 76 years after Roku's death, Rina would have been at least 76 years old when she gave birth to Ursa and at least 97 when she died.)
Complete Monster: Fire Lord Ozai is a genocidal, child-abusing fascist dictator who has dedicated weeks at a time and large portions of his national army to hunting down and killing a twelve-year-old and his friends. He forced Ursa into marrying him, and tried to kill her old lover out of spite. He obtained the throne when he manipulated Ursa into murdering his father to usurp the throne from his grieving older brother Iroh. He then thanked her with banishment from the Fire Nation and threatened to hunt them down and kill the children if she took them with her. He abused his son Zuko out of spite when Ursa claimed that Zuko was not his son even though he knew it was a lie, burned his face for speaking out of turn, and tried to shoot him with lightning when he decides to join Aang. He manipulated his loyal daughter Azula into becoming his perfect little villain to the point where she snaps from the pressure, only to later discard her to a completely meaningless position. Finally, his reaction to news of rebellions in the Earth Kingdom is to try to incinerate the continent. Even after his downfall he stills tries to manipulate his son Zuko into being a tyrant like himself. He doesn't regret any of those moments and feels no remorse for the consequences.
Zuko (especially before his Heel–Face Turn). As horrible as his life was, it makes it easy for the viewers to forget that his motives for going after Aang were entirely selfish. Zhao, Azula, Jet and yes, even Ozai.
Zhao. Unlike Zuko, he wasn't meant to be sympathetic but because Evil Is Sexy he wound up quite popular and many whitewash his transgressions/incompetence, especially with female fans.
Koh as well, to the point where many fans speculated that he would play a significant role in The Legend of Korra.
Dry Docking: Generally, Zutara shippers have the reputation (whether or not it's deserved is an argument that can light a forum ablaze almost instantly) of projecting romance onto the character they identify with and the character they want to tap. However, it's also common for people to go one step beyond and declare that "ZUKO/ME IS THE ONLY THING I SHIP!!!"
Since Kataang fans are more likely to be male than female, some people have started to accuse these men of self-inserting themselves onto Aang, and that they only root for Aang over Zuko because of Nice GuySyndrome. It got messier when the Avatar art book outright stated that Aang's appearance and personality was based on the creators of the show.
This is gone into in the comic "The Search." It's a bit of base breaking, so watch your step.
Combustion Man is a badass assassin with a mysterious past, a completely unique form of Firebending, and leaves more questions then answers. You do the math.
According to creator commentary, he has an extremely overdeveloped third eye, which makes sense as his tattoo looks like the symbol for an Ajna chakra.
What are the stories behind all of Koh's faces?
Answered in "The Search." He's the son of a spirit called "The Mother Of All Faces," who grants people's faces/souls, it's not super clear. He despises her and loves her at the same time, so he steals the things she grants.
Evil Is Sexy: Azula and Ozai. Mai and Ty Lee also, although they're merely antagonists, and not evil.
Family-Unfriendly Aesop: Subverted in the case where the series as a whole, but the finale in particular, looked for awhile to be building up to a very Family Unfriendly Aesop: that sometimes Violence Really Is the Answer. Aang spoke with all of his past lives and was told by Roku, indirectly, about how many lives they could have saved if they had "acted decisively," and by Kyoshi and Yangchen how they were willing to do "anything" to save the lives of millions of people, and that as Avatar his duty was to put the well-being of the people of the world over his own path to enlightenment. Kuruk was the only one who provided a clear opposition to the idea, advising Aang to "actively shape your own destiny." Ultimately Aang chose to go with Kuruk's advice and found a way to stop Ozai for good without having to kill him.
The Great Divide: Lying through your teeth is an acceptable and effective way to resolve deeply ingrained disputes.
Fandom Berserk Button: Never, ever, ever, call this show an anime. It's a common mistake, but doing so gets certain people really angry.
Do 'NOT make assumptions about the show based on the live-action movie. In fact, don't even mention the live-action movie.
Probably not a good idea to refer to Aang as "Avatar" as if it's his name or assume being the Avatar is the same as being an Airbender.
Fan-Preferred Couple: Zutara (Zuko/Katara) is the biggest example— about 22% of the AtLA fanfics at Fanfiction Dot Netalone list the two as main characters. In fact, it is very common among casual viewers to think Zuko and Katara ended up together.
A poll where over 150,000+ people were surveyed showed that Zuko/Katara continues to be more popular than Aang/Katara even after 10 years since the premiere.
Even the majority of the Avatar crew members preferred Zutara over Kataang. Head writer, Aaron Ehasz and director, Giancarlo Volpe shipped Zutara. However, none of them are as vocal about it as Zuko's voice actor, Dante Basco.
Tokka (Toph/Sokka) is Sokka's most preferred couple. And this was before Sukka (Suki/Sokka) was made canon.
Fanon Discontinuity: There are many fans who don't consider the sequel comics to be canon in any way. There is another group of fans who ignore the events of the finale or the entirety of Season 3 altogether. For specific episodes, "The Great Divide" often gets this treatment and to a lesser extent "Avatar Day" and "The Painted Lady".
The sequel series, The Legend of Korra is completely disregarded by many fans of the Avatar franchise.
Genius Bonus: Dear lord, everything. Ozai's title in the finale is probably a reference to the Chinese "fenghuang" (the phoenix lord of demons, which is symbolic in and of itself).
The sheer number of accurate details from different cultures is immensely rewarding for anyone familiar with Asian history.
This is not just Ancient Asian history. Many of the best references and parallels are actually from 20th century China and Japan. Ba Sing Se especially will ring a lot of bells for anyone who's been to China lately.
Growing the Beard: In the trope sense, it seems most of the fans agree the show was great from the start but others like to point at various points in season 1 (and up to Season 2) as to where it "really" hit its stride. "The Storm" which reveals the backstories of Aang and Zuko is a popular candidate.
Another common one is "Avatar Roku: Winter Solstice Part 2" due to it being the first time the Gaang enters the Fire Nation, the first time Aang meets Avatar Roku, the first time Zhao poses a threat to them, and being the episode where we learn that there is a time limit to defeating Fire Lord Ozai. Basically this episode kicks off the main plot.
Iroh exasperatedly telling Zuko he'll never find the Avatar in the first episode. Once you know Zuko's whole backstory, it comes off pretty damn callous in a rewatch since he's offhandedly saying "Oh, just give up on ever returning to your homeland, family, and birthright and go to bed." To be fair, they had no legit indication at the time that it was anything more than a Snipe Hunt used to manipulate Zuko to keep him from turning face in his exile.
In the Guru, Azula taunts to the Earth King when he learns that Long Feng was manipulating him by saying "It's terrible when you can't trust the people who are closest to you." It become dramatically ironic when latter, her own friends Mai and Ty Lee turn against her which causes a big Villainous Breakdown.
Hama passing down bloodbending to Katara doesn't seem like a big deal until The Legend of Korra, where two of the series' main antagonists are bloodbenders, and they don't need a full moon to bloodbend.
Most fans still believe this of a number of Air Nomads.
One of the comics actually had this be true... for a while.
In Universe example: When Aang is told that airbenders have not been seen in a century, he insists that they must be in hiding. Then he learns the truth...
According to Word of God, a small colony of Sky Bison were found by Aang in the remote mountains between the original show and Legend Of Korra, so depending on your viewpoint, the Airbenders really were just hiding.
Careful reading of the old drafts for Avatar will reveal that Aang was not the last airbender and many were just out there hiding. After the war had ended, he set off on a quest with Appa and Momo to find his people. This idea was dropped as the show went on and Aang truly did become the sole survivor as a way to make him tragic and give him more depth. His status as The Last of His Kind has been confirmed by Word of God.
In "The Storm", Sokka describes a dream he had where Momo talked ("You said some very unkind things.") Two seasons later in "Nightmares and Daydreams", one of Aang's hallucinations starts with Momo talking.
In "The Fortuneteller", Katara hopes that the man she marries will be tall. Aang is shorter than Katara in the series, but we find out in The Legend of Korra that he had a growth spurt and wound up being a whole head taller than Katara.
The final scene of "The Ember Island Players" can also come off as this, as many fans came away from The Last Airbender with the same sentiments.
Zuko: That... wasn't a good play. Aang: I'll say. Katara: No kidding. Suki: Horrible. Toph: You said it. Sokka: But the effects were decent.
On top of the constant complaints by the characters that their representations in the play are nothing like real life, accurately mirroring fan complaints of characterization and appearance in the film.
There's also Aang's "Wait, is that a woman playing me?" Aang's stunt double in the movie is female.
The first tie-in video game featured steampunk-heavy people who believed bending to be the source of the all of the world's problems as the antagonists. Now look what's happened in the first season of The Legend of Korra. Somewhere, "the Maker" must be laughing her ass off.
Inferred Holocaust: The show is often quite open about death by kids' show standards, but in particular there is no way that Aang didn't kill a hell of a lot of people in his Avatar-state rampage at the end of "The Siege of the North".
Though Korra may have answered it: An elderly Toph blows her back out doing just one move, forcing her to sit out the rest of the season. Contrast to Bumi still kicking ass at over 100 years old.
Anything related to shipping can generate this.
Iron Woobie: Zuko has been: ignored by his father in favor of his more talented sister, had his mother leave him to protect him, gotten his face permanently scarred by his father for speaking out of turn and protesting a We Have Reserves plan, was banished from his home. After he found Aang, he chased him across the world trying to capture him so he could go home, became a fugitive for failing to capture Aang, and had to steal to survive. After he finally got to go home, he realized his nation was hurting the rest of the world for their own profit, and left again, this time of his own will, in order to stop his Omnicidal Maniac father from carrying out his plans, and was treated poorly by the Gaang even after he was (grudgingly) allowed to join them. Summed up this way during Zuko's Rage Against the Heavens:
Jerkass Woobie: Zuko during Season 1 and early Season 3. Katara in Season 3 counts due to her change in attitude being affected by her mother's death and how she uses Heel–Face Turn Zuko as an outlet to vent out her hatred of the Fire Nation that brought her so much pain. And in the end, Azula becomes one as well.
Also, Sokka. This is the price he pays for having the most onscreen romantic interest.
Zuko. And Azula.
It would just be easier to list who hasn't been paired off with Jin and Ty Lee considering the ships they've launched.
Lost Aesop: "The Painted Lady" seems to be setting us up to learn something about how Chronic Hero Syndrome can be detrimental to the greater good. Except then we're apparently supposed to believe that Katara was right all along—until the villagers call her out for cultural appropriation and making them look like fools. But then Sokka scolds the villagers for their ingratitude. And then the real Painted Lady shows up to and says "thank you," without any explanation of why she'd done nothing to help the villagers herself. Maybe the lesson was about people needing to help themselves instead of expecting supernatural aid, but then what exactly do you call the Avatar showing up unannounced and fixing all of your problems? Meanwhile, Sokka's concerns about them missing the eclipse if they keep stopping to help people are forgotten (in the very next episode they drop everything so that Sokka can learn to swordfight).
Mis-blamed: Some people claim the energybending in the finale was thrown in as an Ass Pull in order to avoid killing on a kids' show, however Mike and Bryan claim to have had the idea as the resolution of the conflict in the series bible from the beginning.
His line "my father decided to teach me a permanent lesson, on my face" is suitably tragic... but still incredibly awkward.
The final fight against Azula, too. "Why aren't you using lightning? Afraid I might redirect it?" Come on, Zuko, that was worse than clichéd. A joke about losing her spark would've even been a better taunt.
Narm Charm: Despite being somewhat narmtastic, Zuko's comment on Mai's beauty ("You're so beautiful when you hate the world.") comes across as being rather sweet and romantic, albeit in an awkward, emotionally repressed teen sort of way. Considering who the little moment is between, the awkwardness of exchanging 'romantic' comments is arguably why it's adorable.
It helps that the "I don't hate you" "I don't hate you, too" followed by the kiss that comes afterwards is Played for Laughs.
Also Zuko's practice attempts to become a good guy and join the Gaang in the beginning of Season 3.
Even Azula has her moments of this when she tries to seduce some of the boys in the beach episode.
Kyoshi is the most direct and pragmatic of the known avatars, but is flanderized by fans into being a Blood Knight who breaths and eats violence just because she took responsibility for Chin the Conqueror's death without a second thought and outright advising Aang to kill Ozai.
Some fans still mock Zuko for needing someone to help him defeat Azula in their final battle, despite the fact that he was clearly winning before she targeted Katara.
Many fans view Zhao as a weakling due to his many failures despite the fact that he's been consistently shown to be a deadly firebender and skilled strategist. One could even argue that he's gotten closer to capturing Aang than Zuko or even Azula ever did.
Despite being initially targeted at elementary school-age kids, the show become quite popular (likely even more popular) among preteens and teenagers. And young adults in their twenties. And not-so-young adults.
Toph being a girl rather than a boy was supposed to appeal to the female demographic... which it did, but the showrunners probably weren't expecting her to be equally popular with teen to college-aged men.
One of the Avatar video games on the Xbox 360 is popular among achievement hunters due to ease of getting 1000 points.
If you buy that it wasn't intentional on the part of the creators, which is a very hard sell. For most people the question is: was Azula messing with Zuko's head...or is she really trying seduce her brother?
It gets even more complicated when there are indications that it is not entirely one-sided. See the Incest Subtext entry on the main page for details.
Rooting for the Empire: Azula's ability to provoke this almost rivals Grand Admiral Thrawn. People want to see her win simply because they know it will be awesome to watch.
Her conquest of Ba Sing Se without lifting a finger is something that must be seen to be believed.
Zuko can provoke this response sympathy for how horrible his life is.
Sacred Cow: It's safe to say that Iroh is this. He's easily the most beloved character in the Avatar universe, but what truly cements this was being voiced by the late Mako, whose passing only amplified people's love of Iroh. It also helps that he is an All-Loving Hero with a backstory that can and will break your heart.
Seasonal Rot: Though not as bad as other examples, many felt that season 3 was one of the weaker ones. Fans were hoping that the Gaang being in the Fire Nation would provide opportunities to learn more about certain characters such as Ozai, Iroh, Azulon, Ursa, Kuzon and Ty Lee however it consists mostly of filler episodes, many which aren't referenced in any other episodes. Many fan-favorites are sidelined such as Toph, Ty Lee, and Iroh. This season also wasted opportunities in returning characters such as Ursa and Koh, while most of the characters they do introduce are only given a single episode or are written off as quickly as they're introduced (Chit Sang is a good example). Also, many found that the writers placed too much emphasis on Rule of Funny or Rule of Cool to the point of being unrealistic.
Ships That Pass in the Night: Teo, the wheelchair bound guy, and Ty Lee, one of the most acrobatic girls around, have some moderate popularity, despite the fact they never interacted and probably never saw each other. Fanfics that ship them usually include a mention of them meeting at Zuko's coronation to get around that problem in the easiest way available.
Spoiled by the Format: The invasion of the Fire Nation on the day of the solar eclipse is built up as the final confrontation, and the final blow to end the war. Too bad it happens in episodes ten and eleven out of twenty-one.
Ty Lee! She is a fan favorite with a unique ability, and is much nicer than Azula or Mai despite being an antagonist. We never really learn anything about her (other than she comes from a big family where she felt overlooked), and we only see her three times during season 3, only in one of these episodes was she a major character.
Fire Lord Ozai never really got much character development or backstory despite his importance in the series.
Princess Ursa, Zuko and Azula's mother. Though she did appear in the sequel comics. Still, many fans hoped to see more of her during the actual show itself.
Ozai and Iroh's father, Fire Lord Azulon was only briefly seen in one flashback episode and mentioned in passing in another. Despite being the Fire Lord before Ozai and despite the fact that most of the Hundred Year War passed during his reign we know next to nothing about him.
Koh, the Face Stealer is quite popular with many fans, yet we never see him after his debut (at least, not in the show proper. He makes appearances in some sort of (now defunct) online game and the sequel comics). Still, some fans are disappointed that he didn't appear in the show itself.
Aang's old friend Kuzon. Though he was most likely dead by the time of the show, it is a shame that we never really learn anything about him, not even a flashback. This becomes especially annoying in season 3 where the Gaang visit the Fire Nation, giving us the perfect opportunity to learn more about him including his friendship with Aang, his role in the war, and his possible connection to Zuko (due to their similar names and the fact that Aang compared the two). Word of God originally stated that Kuzon would play an important role in a Season 3 episode, but this unfortunately never came to be.
Azula's elderly advisors/instructors Lo and Li originally seemed to be Azula's equivalents to Zuko's Iroh only much colder in personality. Come season three, their role becomes more comical and it's revealed that they aren't even firebenders which makes absolutely no sense considering that it was implied that they were her firebending instructors.
Chit Sang was an interesting character who briefly joined the group along with Hakoda midway through season 3 only to leave the following episode without a single line of dialogue!
Waterbenders in general. Other than Katara we only really get one episode per season featuring other waterbenders, even in book one (water). Somewhat justified in that they only live at the poles, but still, compared to the amount of earthbenders and firebenders we see, it would've been nice to see some more waterbenders.
Airbenders too. Sure, given the title, this is pretty justified, but it would've been nice to have seen more of Aang's flashbacks which could've featured other Air Nomads.
Bryke said that more airbenders would be introduced in Season 2 and 3 (either as flashbacks or as the hiding diaspora), but they decided against it in the end.
Iroh's journey to the Spirit World has left fans with many questions, yet has never been touched upon.
Actually Iroh's entire past. There was originally going to be an episode focusing on Iroh's backstory, but it was scrapped.
Zuko reuniting with his mother. Though this did eventually happen in the sequel comics, many fans feel that she should've appeared in the show itself.
What makes this worse is that before season 3 aired, it was said that Zuko would begin searching for his mother in the season. Guess what never happened.
Koh ominously told Aang that they would meet again. This never happened onscreen.
Xin Fu and Master Yu seemed like they would become recurring antagonists in season two. They were only seen two more times and their role was greatly rushed at the end of the season. Furthermore, Xin Fu's plan to capture Aang for the Fire Lord seemed to have been thrown out.
On top of that, the whole mistaken-kidnapping plot around Toph was resolved off-screen, including the revelation to the Gaang that she had lied about joining them.
What Do You Mean, It's for Kids?: While it seems to be primary a kids show, it does has its fair share of horror and especially in the third seasons deals with a series of very tough issues. The main character is the lone survivor of a genocide during which an ethnicity was completely wiped out and the 100 year long war seems to have spared not a single family from having lost relatives in combat or war crimes. Some episodes in the 3rd season even deal with an assassin hired to kill the protagonists and one of the heroes setting out to kill the murderer of her mother.
About the only tell (aside from the squeaky-clean language) is when characters are strangely incapable of outright suggesting they will kill each other. Further, while some characters are shown dying in the series, their deaths are never depicted outright (poked fun at in "Ember Island Players"). However, sometimes even Never Say "Die" can get lifted - such as showing Gyatso's remains a whopping two episodes into the series.
This show has two diametrically opposed Woobies at the same time, in Aang and Zuko especially after "The Storm" where we learn about Aang's feelings of guilt over running away from home and Zuko's abuse and exile at the hands of his own father (demonstrated nicely here). It's little wonder that Zuko got the Draco in Leather Pants treatment from the fans.
Katara when it comes to her mother's death, but became a Jerkass Woobie in Season 3 when she then uses Zuko, who becomes a member of the Gaang, as a mis-directed outlet due to his prior bad history with the Gaang to vent out her hatred of the Fire Nation that caused her mother's death and other turmoil in her life.
Sokka gets some of this from time to time, too, especially in "The Waterbending Master", "The Siege of the North", and "The Boiling Rock".
Then there's Azula, who goes from one of the greatest Magnificent Bastards to The Woobie over the course of only four episodes. And it actually works.
Appa during Season 2 - the episode "Appa's Lost Days" has him go through a certain level of Hell.
Even the pathetic and powerless Ozai after the end of the war is Woobie-ish for some.
Iroh, in an Iron Woobie kind of way, in that he doesn't let it show very often. For most of the series, he looks like a funny, yet awesome character who always has Zuko's best interests at heart... But then we find out that he lost his son in the siege against Ba Sing Se that he led, and it goes downhill from there.
Ty Lee, considering her childhood of neglect, the fact that she only befriended Azula out of fear, or that all she wanted was to be a circus performer but Azula bullied her into giving up her dream to join her in her hunt for the Avatar.
Then there's the Boiling Rock, one of the harshest versions of The Alcatraz in western animation. Horrible treatment aside, guards regularly let other guards enter prison cells to rough up the prisoners, with being caught doing so just resulting in little more than an exasperated sigh. Not to mention it's a given that the guards at the Boiling Rock torture prisoners for information in canon, and Suki was the leader of the group of warriors found in the company of the avatar's primary means of transportation, it seems likely that she would have been "interrogated" about his location.