Minerva McGonagall is a major character in the Harry Potter franchise. She is the Transfiguration teacher at Hogwarts School of Witchcraft and Wizardry during the events of Harry Potter series. She is the only daughter of Robert McGonagall senior and. McGonagall acts as a stern but caring grandmotherly figure for her students, especially Harry Potter, Ron Weasley and Hermione Granger. She is also loyal to Albus Dumbledore, who she considers one of her closest friends. After the War, she became the Headmistress of the school.