Remus Lupin. Remus Lupin is a character in the Harry Potter book series written by J. K. Rowling. Lupin was bitten by a werewolf when he was very young. His parents were both upset by this, because it meant he could not go to Hogwarts School of Witchcraft and Wizardry. However, when Albus Dumbledore became headmaster, he let Lupin go to Hogwarts.