Aang is in MUN and always represents a small nation whose main export are cabbages. He gets mostly A's and B's, and his favorite class is philosophy. He's always changing clubs because he wants to try everything. Hates homework because he just wants to hang out with friends after school and have a good time.
Sokka is a straight A student but also the class clown. The guidance counselor made him tutor other students but that didn't go well because his patience is low. Head of the robotics club and always wins competitions. He always studies with Suki whatever chance they get. His first gf transferred when they were freshmen.
Katara is the pretty girl who gets straight A's and you just know she's going to Harvard. She's also a tutor and a good one. She's nice to everyone and everyone likes her except for when she reminds the teacher to collect the homework. She's also in MUN. Sometimes she corrects the teacher in a way that she doesn't think is embarrassing but it is.
Toph could totally get good grades if she wanted to but school is not her thing. If her parents weren't pouring such a large amount of money into the school, she would've been kicked out by now. She stands up for bullied students but doesn't befriend them. She's also the QB on the boy's football team.
Suki is an A and B student. She's captain of the girls soccer team and they are undefeated. She's also on the girl's basketball team. Her favorite subjects are Art and History. Every now and then she'll wear a full face of makeup, pulling off unique looks that you didn't think would look nice.
Azula is in every advanced class and gets A's in all of them. Never misses the chance to humiliate someone who got the wrong answer in front of the whole class. She's the school bully and if her father wasn't funding the school so much, she'd get kicked out.
Zuko is a C (and B every once in a while) student. He tries his hardest in most classes but for some reason still has trouble with tests and homework (the letters get mixed up and just seem to float of the page sometimes). He's captain of the basketball team, and is their star athlete. Everyone knows he's going to get scouted one day. He gets detention for yelling at teachers sometimes. Walks home with Mai because the car his dad sends only picks up Azula.
Mai. The emo chick. She doesn't want to be at school. All of her classes are boring but she's still doing well in all of them. Pretends to be asleep during class but she's listening to the teacher. She's not interested in any extracurriculars, only shows up to basketball games to support Zuko.
Ty Lee gets straight C's and D's. She always raises her hand even though she gets the wrong answer most of the time. Hard to find a guy in her grade that doesn't have a crush on her. Captain of the cheerleading team and the she's on the soccer team. P.E. is the only class she gets A's in. Everyone picks her first when choosing teams. Begs Azula and Mai to hang out in the city after school.
Iroh is the philosophy teacher. Everyone thought his class would be boring but they actually look forward to it. He lets the shy, friendless kids eat lunch in his class when everyone else is in the cafeteria. Students go to him for advice with personal problems more than the guidance counselor.