Professor Snape

The grumpy Potions Master, Professor Snape, doesn't seem much fun – but stick around, this is a complicated character! In Harry's first year, Professor Snape boasts about the 'subtle science and exact art of potion-making' – and mostly dwells in the dungeons being mean to the students (apart from the Slytherins, as he just so happens to be their Head of House!).