Installments: All except for Order of the Phoenix and Half-Blood Prince

Percy, like in the movies, is an uptight stickler for the rules. He's always looking for ways to make more of a name for himself. Percy is old enough that his voice is already matured at the start of the series. However, once he's hired by the ministry, he becomes deliriously happy for almost the entire remainder of the series, and his voice should be more high-pitched.