Sora
Sora is the main character of Kingdom Hearts 2. He is the wielder of the Keyblade, a powerful weapon that can save the worlds, and conversely, destroy them when in the wrong hands. Sora is a very skilled warrior, as he can off many enemies with relative ease, and he can also use magic, though at the beginning his abilities in both fighting and magic are relatively weak, due to his sleep in a pod in the basement of the Haunted Mansion in Twilight Town. He gains new clothing through the three witches in Yen Sid's castle, clothing which allows Sora to transform into new Drive Forms, such as Valor, Wisdom, Master, Final, and Anti-Sora. It also allows him to use Magic without hesitation, as it pulls magic from his surroundings and recharges his Magic. Sora is a loyal friend to anyone he cares about, and will not back down from helping them out.
Donald Duck
One of Sora's best friends. He and Goofy are searching for king Mickey after he left the castle, and assisting Sora. Donald is the court magician of Disney Castle, and as such, is the most powerful magic wielder in your group (at least until Sora levels up magic all the way). He wields a magic staff, and has a hot temper, but can (and will) prove useful in battles against multiple enemies and bosses.