So, anyone wanna take a shot at typing the characters? I absolutely LOVE this show. The characters are brilliant, and their friendships are timeless. Everytime an episode ends and I see the credits I feel tingles all over my body. Such a simple yet beautiful show.
I'm not completely confident in my guesses. I didn't go through and match up their dominant and secondary functions to see if it works.
Aang - ENFP (Ne/Fi)
It seems that the ENFPs love to get that extra squeeze out of life, and Aang does just that. He always finds some weird or strange way to play a game or have fun. Also, being from the Air nation, he does have ENFP-like worries about being controlled as seen in the teams stay in the structured Ba Sing Se.
Kitara - ESFJ (Fe/Si)
Kitara absolutely believes in helping others, even if it means self-sacrificing her needs. "I will never, ever turn my back on people that need me!" I wanted to type her as an introvert at first, but I realized that she was more Fe than she was Fi. In the episode where Zuko joins the party, she threatened to kill him if he did anything fishy, which is very unlike her. This reminds me of my ESFJ mother who has said similar things to people who have threatened/hurt her children.
Sokka - ENTP (Ne/Ti)
I wasn't quite sure what Sokka was until I realized how much he relied on ingenuity and how he was definitely the "inventor" type. He sees a world of possibilities, and when under pressure he can quickly use his Ti to come up with a working plan.
Toph - ESTP (Se/Ti)
She desires to do what she pleases and is not too happy with compulsory activity. This is simply another guess.
Zuko - ISTJ (Si/Te)
He is very serious about his duties and responsibilities, and is a very serious person in general.
Uncle Iroh - ESFJ (Fe/Si)
Just a guess.
Azula - ENTJ (Te/Ni)
Oh man... She simply radiates being an unhealthy ENTJ. She has a strong desire for dominance, and seems to always be planning what could be. She relies on empirical thought first, and then lets her intuition fill in the blanks when she is planning. She is a very unique villain.
Ty Lee - ESFP (Se/Fi)
Honestly, what else could she be? She lives for the moment and enjoys her good share of fun. She has in inner emotional flame, shown to use in The Beach, when she expresses how she was afraid she would never stand out from her 6 sisters and would always be part of a "set". She often flirts with boys and usually has a group of them surrounding her, hinting at her fear of being alone.
Mai - INTP (Ti/Ne)
Haha, I finally found my own example of an INTP. She prefers her solitude and is willing not to put too much effort into anything, as seen when she refuses to chase after Kitara and Sokka through the slime waste in the episode The Drill. I was torn between if she was an ISTP or an INTP, but she never expresses any kind of Se habits so I decided on INTP.
Feel free to correct me. I'm more concerned about getting them typed correctly than being right. I like relating the MBTI to anime/cartoon characters since they seem to be a little on the melodramatic side, letting their true colors shine through. It's easier for me to recall what a stereotypical ENTP is like when I think of Sokka versus thinking of Alexander the Great, whom I know nothing about.