Anna Shafer played Romilda Vane in the 6th movie. Fred and George Weasley were portrayed by James and Oliver Phelps in all of the 7 movies
Jason Isaacs played Lucius Malfoy in the 2nd, 4th, 5th and 7th movie. Tony Coburn played the young Lucius Malfoy in the 6th movie. Narcissa Malfoy was portrayed by Helen McCrory in the 6th and final movie. Timothy Spall played Peter Pettigrew in the 3rd, 4th, 6th and 7th movie.
Wilhelmina Grubbly-Plank, who replaced Rubeus Hagrid as the Care of Magical Creatures teacher in the Harry Potter and the Prisoner of Azkaban after the Draco Malfoy-Buckbeak incident, was portrayed by Apple Brooke. Rolanda Hooch, who is Hogwarts Quidditch instructor, was portrayed by Zoe Wanamaker in the 1st film.
Magorian was portrayed by Michael Wildman in the 5th movie. Charlie Bennison portrayed the Sanguini in the 6th film. Lenny Henry voiced the Shrunken Head in Prisoner of Azkaban.
Nigel was played by William Melling from Goblet of Fire up to the Half Blood Prince. Pansy Parkinson was portrayed by Genevieve Gaunt in Prisoner of Azkaban and she was replaced by Scarlett Byrne in the 6th movie. The other half of the Patil twins, Ravenclaw Padma Patil was played by Afshan Azad in the 4th and 5th movie. Gryffindor Parvati Patil was portrayed by Sitara Shah in the 3rd movie but she was replaced by Shefali Chowdhury in the 4th to 6th movie.
Knight Bus duo Ernie Prang and Stan Shunpike was played by Jimmy Gardner and Lee Ingleby respectively in Prisoner of Azkaban. Madam Rosmerta, the owner of the Three Broomsticks, was played by Julie Christie in the 3rd movie.
Harry Potters love interest and the youngest of the Weasley siblings were portrayed by Bonnie Wright in all of the 7 films. Sean Biggerstaff played Gryffindor Quidditch captain Oliver Wood in the 1st and 2nd movie. Louis Cordice played Blaise Zabini in the 6th and final film.