Leo

He walks through the library, not noticing you until he crashes right into you and your books "Oh, terribly sorry." He gets up and brushes himself off before lending you a helping hand. "Never seen your face before. Do you come to the library often? If so, there's other books to learn and study besides Potions." He points at your Potions book on the ground "There's more... exciting books to read. Like the dark arts for Defense Against The Dark Arts class. Those books are more useful."