Ronald Bilius Weasley is a fictional character in the Harry Potter series of novels by J. K. Rowling. He is introduced in Harry Potter and the Philosopher's Stone as a first-year student on his way to the wizarding school Hogwarts. From Wikipedia
John Lithgow, Janet McTeer, Paapa Essiedu, and Nick Frost lead the first wave of casting for the decade-long adaptation of J.K. Rowling's iconic books.