There is already a live-action movie version of Avatar: the Last Airbender from Netflix in the works, so fans of the animated series can rejoice at the news that there is now three animated movies being developed, according to Variety. A widely celebrated show, the cartoon continues to have a massive fanbase that spans generations and bridges the gap between children's and adults' televised entertainment.
In this Ranker article, the adult fans of the show have voted on which characters they would have liked to see a little more adult out of in of verbal vulgarity. A world in which these characters allow themselves some more slack in their speech is definitely something that some fans would want to explore.
Note: Ranker lists are fan-voted, live, and continue to accrue votes, so some rankings may have changed after this publishing.
Momo
A lemur of few words, every moment of Momo's screentime is delightful. Though the only instance in which the audience hears the pet speak is within a fever dream of Aang's in season 3, each and every coo he elicits exudes an adorable energy people can't help but gravitate toward.
People have always loved Momo and the only thing that could possibly top off his mischievous ways is if they were punctuated by the occasional profanity. Though given Sokka's disdain toward Momo in the first season, it may have been for his own good that he didn't have the opportunity.
Katara
The Waterbender fulfills many roles throughout the show. Katara is the mom of the group, the annoying little sister, the teacher, and the love interest, and from her introductory moments, she doesn't take any misogyny or inequality from anyone.
Whether the opportunity to swear had been woven into her disapproval of Sokka's behavior toward her in the very first scene of the show, perfectly timed during her first battle with Waterbending master Pakku at the North Pole, or at the moment she meets the man who killed her mother, Katara definitely went through her trials throughout the show, and anyone in the same circumstances as her in a more PG-13 setting would probably not have been able to hold back.
Azula
When considering Azula's temper, it's almost difficult to believe she never did swear. Despite being only 14 years old, Azula is a Firebending prodigy and an absolute evil mastermind, even into her final moments of sanity at the end of the show's run.
When she does approach her enemies, Azula always makes an effort to get inside their heads, whether that be with simple childish taunting toward her brother or carefully constructed lies and deceit. Either way, it wouldn't be outside the realm of possibility that Azula always was allowed to swear, but just considered herself above it.
Mai
Mai is often reduced merely to Zuko's love interest, but the fighting prodigy has always had very much a mind of her own. Even without bending abilities, Mai always had the upper hand in any situation be it physical combat or battle of the wits, and her dry humor and pessimistic views on the world immediately made her a fan favorite character after her introduction in Avatar's season 2.
Mai's character and attitude would have translated over very well to a modern-day teenager of the same age, so having a similar bite to her language would have not only added to the character's comedic value but enhanced her believability as the underwhelmed 15-year-old she always was.
June
Though many say she may have left Avatar too soon, June made quite an impact on the fanbase during her bit of screentime. She was an interesting character with unclear motives and appeared to be the in-universe equivalent of a stereotypical biker or gang member. She and her pet shirshu, Nyla, worked for themselves and only themselves and although they were introduced as antagonists, they were later seen to be of no harm.
Though the character's backstory was never flushed out, the tough-as-nails persona most definitely had some more depth to it. It is no doubt that in her time off-screen, June absolutely has the mouth of a sailor, soft spot for Nyla aside.
Sokka
Sokka is often seen as the comic relief of the group. Though he went through many crucial moments in developing his character and overcoming true obstacles, it's no doubt that an expletive or two from his mouth would have absolutely gotten a good laugh out of his surrounding friends and viewers alike.
Sokka's sincerity combined with his affinity for goofing off makes him the perfect candidate for a swearing experiment in the world of Avatar. As the obnoxious older brother of the group, he could have quite the arsenal of colorful words to use, all of which were very fitting to his speech.
Zuko
From banished prince to esteemed and honorable Firelord in just three short seasons, Zuko's redemption arc is seen as one of the most well-executed in televised history. Though Zuko may have done much more good for the characters and the show's plot in later seasons, he remained his bitter and angry self even through that.
Zuko's bite never left his character, no matter how comfortable he became as a part of the Gaang. Much like his sister Azula, had the show not been specifically made for a children's network, it would almost be hard to believe he didn't swear at all through its run.
Avatar Kyoshi
Avatar Kyoshi is often considered to have been one of, if not the, most powerful Avatars of all time. Standing at 7 feet tall, with a taste for revenge, and the ability to literally move mountains, Kyoshi's person has always been portrayed as fairly intense, and it could be expected that she would have vernacular to match.
Since the show's conclusion, Kyoshi's story has been adapted into two novels that flesh out her early struggles in coming to with her identity as the Avatar. It gives much more depth to who she is, and why she behaves the way she does in the brief brushes with her character that the viewers receive. Though it might be fun to hear her drop a few swear words, Kyoshi is clearly a much more disciplined and complex woman than the fanbase often gives her credit for.
Cabbage Merchant
A running gag throughout the series and a background character immortalized in just his few lines, the Cabbage Merchant quickly became the ultimate enemy of the Gaang and an absolute icon in the show. Each time something goes slightly askew in the Earth Kingdom, it is a guarantee that the main characters will run into this innocent merchant and ruin his cart of cabbages.
A character of incredibly few lines, every single bit of his dialogue laments his misfortune regarding the destruction of his cabbages. He appears to be on the verge of tears at any given moment. And given that he has already resorted to proposing decapitation as punishment for knocking over his vegetables, something about this character just feels like an F-bomb ready to explode.
Toph
Toph is the most powerful Earthbender of her time, having invented the concept of Mentalbending and perfected Sandbending in just a few short months. Because of her temper, she is arguably one of the most meme-able characters in the show with some of the best moments and lines, making her easily the best and funniest choice for a chance to curse someone out.
The 12-year-old girl is one of the toughest characters in any show, defeating hulking men in combat with just a flick of her wrists and towering over them laughing when they fall. Without a doubt, if she could, Toph would use every expletive in the book in quick succession and then invent her own before her opponent (or friend) could even begin to a response.