Professor Flitwick
Background
Flitwick is the charms professor at Hogwarts School of Witchcraft and Wizardry. He is the head of Ravenclaw.
During the events of Harry Potter and the Sorcerer's Stone (2001) played by Warwick Davis
Professor Flitwick teaches the students about the making of charm spells that can make things fly. As Ron Weasley is trying the spell, Hermione Granger corrects him in the proper way of saying the spell.
During the events of Harry Potter and the Chamber of Secrets (2002) played by Warwick Davis
Professor McGonagall tells Professor Snape, Madam Pomfrey, Professor Flitwick, and Mr Filch, Ginny Weasley was taken to the Chamber of Secrets and all the students must be sent home. Before the end of the year feast, Albus Dumbledore asks for a round of applause for Professor Sprout and Madam Pomfrey and all of the students and professors clap, including Madam Pince. Hagrid returns and everyone gives Hagrid a round of applause.
During the events of Harry Potter and the Prisoner of Azkaban (2004) played by Warwick Davis
Harry Potter, Hermione and Ron arrive at school where Professor Flitwick leads the choir in a rendition of Double Double Toil and Trouble from Macbeth. Before their feast, Albus Dumbledore introduces the students to Professor Lupin. Dumbledore announces that Hagrid will be teaching the Care of Magical Creatures course and as Hagrid stands up, he knocks the table, causing Professor Flitwick to have to grab it..