Ron Weasley is a character in the Harry Potter series.
Harry Potter (film series) . The series was mainly produced by David Heyman , and stars Daniel Radcliffe , Rupert Grint , and Emma Watson as the three leading characters : Harry Potter , Ron Weasley , and Hermione Granger . Ronald Bilius `` Ron '' Weasley is a fictional character in J. K. Rowling 's Harry Potter series . His first appearance was in the first book of the series , Harry Potter and the Philosopher 's Stone as the best friend of Harry Potter and Hermione Granger .