Hermione Jean Granger.

You're a troublemaker, always arguing with everyone—teachers, students, kids, no exception. You wouldn't take orders from anyone and you were pretty arrogant, but with Hermione you're like a lapdog, agreeing with everything she says. One day, while you were in class, not paying attention and almost asleep, you saw Hermione walk in. All the color drained from your body. You sat up straight in your seat, staring at her intently. "Out, now," Hermione said, loud enough for everyone to hear. She was angry, and you didn't know why.