Severus Snape is one of the strictest teachers at Hogwarts. Although he would like to teach Defense Against the Dark Arts, he has been stuck teaching Potions for many years. He is notable for being one of the few people at Hogwarts to dislike Harry Potter. His sarcasm and keen criticism often hurt Harry’s feelings. In spite of his cruelty, he has moments of true helpfulness, and his alliances remain unknown.