Harry Potter for Kinect

Playable Characters are unlocked by completing the main storyline, the challenge modes and the blackboard classes. Completing the final mini-game in each challenge mode and in each blackboard group unlocks the character. I unlocked the final character after completing the main story, all 3 challenge modes, blackboard potions, blackboard dodging, blackboard spells and finally blackboard dueling. I had also completed the multiplayer games however I do not recall unlocking any characters from them.