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Professor Snape (Harry Potter)

Ah, Snape. You either loved him or hated him (until the end, when of course, you loved him, out of sympathy if nothing else). Did you know that the cold, greasy-haired potions teacher-turned-headmaster was actually inspired by JK Rowling’s old chemistry teacher, John Nettleship? Nettleship was unaware that he motivated such a character until his wife and students eventually figured it out. To make things slightly suspicious, Rowling’s mother actually worked with the chemistry teacher in the same school so we wonder if anything happened between them, Lily/Snape style! Nettleship described himself as "a short-tempered chemistry teacher with long hair... [and a] gloomy, malodorous laboratory” but claimed: "I was horrified when I first found out [I was the inspiration]. I knew I was a strict teacher but I didn't think I was that bad.”

CHARACTERS YOU WON’T BELIEVE ARE BASED ON REAL PEOPLE

Sometimes the most lovable movie heroines and terrifying villains are so incredible, we think they couldn't possibly be based on a real person. Well, actually, these ones are! Drumroll please...