Remus Lupin is a fictional character from the Harry Potter series created by J.K. Rowling. He is a werewolf and a former student at Hogwarts School of Witchcraft and Wizardry. Lupin is known for his kind nature and his role as a Defense Against the Dark Arts teacher. He is also a member of the Order of the Phoenix, a group fighting against the dark wizard Voldemort. Lupin was bitten by a werewolf as a child, which caused him to transform during full moons. Despite this challenge, he is respected for his intelligence and bravery. He is a close friend of Harry Potter's father, James Potter, and serves as a mentor to Harry throughout the series.