Canon Harry can be an arrogant, disobedient, rude, lazy, bad tempered, stubborn, uncooperative little rule-breaker. He leaps to conclusions and he is dismissive of adults who have greater knowledge and experience because he thinks he knows better. Until the bitter end, he continues to divide people into good and evil based on whether they're NICE to him. He shows almost no ability to change his mind about people he doesn't like. I'm not sure what positive qualities he would display under the circumstances (high stress, being kept from doing what he wants, etc.).