This list includes characters who have been mentioned or introduced so far. The majors I chose are based on a combination of their personality, their actions in the KH games, and their actions in Spring Nicht. More info to come as more chapters come out! :)
Axel Atish: (Sophomore--Psychology) Axel, much like Zexion, is a master manipulator. He likes getting into the heads of other people and figuring out what they're all about. A strong knowledge of psychology enhances his intrinsic ability to manipulate others.
Zexion: (Sophomore--Psychology/Pre-Med) Zexion was the Cloaked Schemer when he was a member of Organization XIII. He is also a skilled manipulator, but with a slightly different approach. He is more calculated and aloof in his observations, and tries to keep people at a distance and not get so directly involved. He likes to keep things more scientific and objective than Axel. He wants to go medical school for Psychiatry.
Demyx Mizu: (Freshman--Music/Music Education) Demyx loves music--it's his life. He enjoys all kinds of music, and it's his dream to become a performer. He's getting a teaching certification as his backup, but he wouldn't mind being a teacher. He loves music so much, it doesn't matter what he does with it--as long as it's a part of his life.
Roxas Figaro: (Freshman--Business Management) So far, Roxas has told Demyx that he thinks it would be cool to run a business. Are there more reasons he's not telling?
Sora Figaro: (Freshman--Undeclared) Sora doesn't know what he wants to do with his life yet, but he's got time to decide--he's a freshman.
Kairi Figaro: (Freshman--Marine Science) Kairi is fascinated by water--it's something that connects all living beings. There's something calming about going to the beach and just gazing out at the ocean. She'd like to find out just what it is that lies beneath the surface that makes water so captivating.
Naminé Figaro: (Freshman--Art/Pre-Med) Naminé has always loved art since she was a kid--even if she wasn't the best artist. She wants to be a doctor someday.
Marluxia: (Sophomore--Biomedical Engineering) Marluxia is a creative thinker and a designer--who else could have been the one to engineer the original 'overthrow Xemnas' plot in Kingdom Hearts: Chain of Memories? He'd like to take those creative skills and apply them to a field that gives him options...anything from designing human body parts to genetic engineering.
Larxene: (Sophomore--Theatre Arts) In KH: CoM, Larxene uses exaggerated body gestures and facial expressions--she likes acting. She's pretty. What could go wrong?
Riku Wattan: (Freshman--Physics) In KH, Riku wondered about other worlds--in other words, his physical surroundings. He has special interest in astronomy, black holes, and higher dimensions. Based on his studies in science and mathematics, he wonders about he possibility of parallel universes.
Leon Figaro: (Junior--Computer Science) He seemed to work well enough on the computer system in Hollow Bastion in KHII. Also, the whole "Can't you figure it out?" line seems to imply that he thought the job he was asking Sora to do was easy, even though Sora struggled with it. Leon is also the type to avoid getting close to people, and Computer Science allows him to do just that.
Cloud Chere: (Junior Transfer--Computer Science) Cloud too is content with as few words as possible. Computers perpetuate that lifestyle. He knew going into Comp Sci that he'd be able to get away with not talking to people.