McGonagall is described as a rather severe-looking woman who is wearing square glasses. Her black hair is often drawn into a tight bun.
McGonagall comes off as a very strict teacher that is a little bit rough sometimes, but she still shows a lot of sympathy for her students. She values hard work and tends to stick to the rules, but she does exceptions sometimes when she feels like it's justified. She does what it takes to keep her student safe, and takes no nonsense from anyone, students or fellow Hogwarts staff and adults.