"The first boy is named Derek, he has spiky black hair and draws pictures of knives on his arm. He's 13, and said he was sent here because everyone at Juvenile Hall was scared of him." -Andy, Calvin and Hobbes 2
Derek is a character in Calvin and Hobbes 2. He was called by Andy for help to destroy Rupert. He has a stuffed wolf named Lobo. He helped distract the guards, along with Stupendous Man.