Casting
Shyamalan originally offered the roles of Aang to Noah Ringer; Sokka to Jackson Rathbone; Katara to Nicola Peltz; and Zuko to Jesse McCartney. In an interview with People, Shyamalan claimed that he did not want to make The Last Airbender without Nicola Peltz, "I said that only once before in my career, and that was when I met Haley in The Sixth Sense auditions."
In February 2009, Dev Patel replaced Jesse McCartney, whose tour dates conflicted with a boot camp scheduled for the cast to train in martial arts. However, McCartney has since claimed that he had been replaced by the producers for political reasons shortly before filming began, and had no say in the matter. Katharine Houghton played "Gran Gran", the grandmother of Katara and Sokka, and Seychelle Gabriel portrayed Princess Yue, a love interest of Sokka's and princess of the Northern Water Tribe. Isaac Jin Solstein played an earthbending boy. Comedian Aasif Mandvi was cast as Commander Zhao, Cliff Curtis as Fire Lord Ozai, and Keong Sim was cast in the role of an Earthbender.
Ringer began practicing Taekwondo – the martial art and national sport of Korea – at the age of 10. He began shaving his head during his martial arts training to help cool off, which gave him the nickname "Avatar" due to his resemblance to Aang from the animated series. When he heard about the film adaptation, he made an audition tape with his instructor and sent it to the filmmakers. Having not acted before, Ringer was required to attend acting school a month before filming commenced. Peltz was familiar with the character before submitting for the part of Katara, having been a fan of the animated series.
Before Slumdog Millionaire was released, Patel auditioned for the role of Zuko by submitting a tape to the studio. Shyamalan called Patel personally to inform him that he got the part. Training for the film was intense, as he had to learn Wushu and different martial arts. Patel recalls fighting, punching, and throwing, and said the experience was "truly amazing." While he was filming Slumdog in India, he would finish a take and turn one of the channels over to the animated series. Even though it is based on a cartoon, he wanted to bring as much of himself as possible to the character he was portraying. Shaun Toub, who was cast as Iroh, describes his character in the first film as "loose" and "free". He compares Zuko's "obsession" to his childhood memories and how kids are always looking for their parents' approval, saying that Zuko just wants his father's. "He isn't necessarily bad; he just has a great deal of built up anger and forgets to consider others. I think people will understand that he's not bad, he's just angry and hurting because he really wants his father to love him, but his father is too busy with other things." He says that Patel was able to influence him into appreciating the business of filmmaking more. While comparing the animated series to the film, he says the film is much more serious. He attributed this change to the director trying to relate to every age group, rather than just kids.
The casting of white actors in the East Asian and Amerindian-influenced Avatar universe, as well as the fact that the casting of the heroes and villains seemed to be racially backward from the show, triggered negative reactions from fans marked by accusations of racism, a letter-writing campaign, and various protests. "To take this incredibly loved children's series, and really distort not only the ethnicity of the individual characters but the message of acceptance and cultural diversity that the original series advocated, is a huge blow," said Michael Le of Racebending.com, a fan site calling for a boycott of the film. As a result of the casting, the Media Action Network for Asian-Americans also called for a boycott of the film. "This was a great opportunity to create new Asian-American stars...I'm disappointed," stated Guy Aoki, president of the organization. After a casting call specifically looking for "Caucasians and other ethnicities," Shyamalan explained that "Ultimately, this movie, and then the three movies, will be the most culturally diverse tent-pole movies ever released, period," to reassure critics. Furthermore, Paramount provided a statement about the casting choices, "The movie has 23 credited speaking roles – more than half of which feature Asian and Pan Asian actors of Korean, Japanese and Indian descent. The filmmaker's interpretation reflects the myriad qualities that have made this series a global phenomenon. We believe fans of the original and new audiences alike will respond positively once they see it."
Shyamalan commented on the issues regarding fans' perceptions of the casting, "Anime is based on ambiguous facial features. It's meant to be interpretive. It's meant to be inclusive of all races, and you can see yourself in all these characters...This is a multicultural movie and I'm going to make it even more multicultural in my approach to its casting. There's African-Americans in the movie...so it's a source of pride for me. The irony that [protesters] would label this with anything but the greatest pride, that the movie poster has Noah and Dev on it and my name on it. I don't know what else to do."
Rathbone also dismissed the complaints saying, "I think it's one of those things where I pull my hair up, shave the sides, and I definitely need a tan. It's one of those things where, hopefully, the audience will suspend disbelief a little bit." The controversy was poorly received by critics as well. Film critic Roger Ebert was one of the critical voices against the casting. When asked about casting a white cast to portray the characters, he said, "The original series Avatar: The Last Airbender was highly regarded and popular for three seasons on Nickelodeon. Its fans take it for granted that its heroes are Asian. Why would Paramount and Shyamalan go out of their way to offend these fans? There are many young Asian actors capable of playing the parts."
In July 2013, series co-creator Bryan Konietzko responded to an online comment about skin color in The Legend of Korra. Konietzko wrote that his work on the two series "speaks for itself which obviously does not include the gross misinterpretations and misrepresentations of our work in [Shyamalan's] work."