'''Minerva McGonagall''' assistant headmistress of Hogwarts in the ''Harry Potter'' series by JK Rowling. She is head of Gryffindor house and transfiguration teacher She is usually rather strict but not in a cruel or "by the book" way. | '''Minerva McGonagall''' assistant headmistress of Hogwarts in the ''Harry Potter'' series by JK Rowling. She is head of Gryffindor house and transfiguration teacher She is usually rather strict but not in a cruel or "by the book" way. |