Put on your Time-Turners, and be prepared to be blown away.
Daniel Radcliffe (Harry Potter)
Fun fact: Radcliffe destroyed almost 80 wands throughout all of the films because he pretended they were drumsticks.
Getty / George De Sota / Ian Gavan
Emma Watson (Hermione Granger)
Fun fact: Hermione's last name was almost "Puckle," but was later changed (thank goodness).
Getty / Hulton Archive / Ian Gavan / Stringer
Rupert Grint (Ron Weasley)
Fun fact: J.K. Rowling was extremely close to killing Ron. In the Deathly Hallows: Part 2 DVD commentary Rowling said, "I planned from the start that none of them would die. Then midway through, which I think is a reflection of the fact that I wasn't in a very happy place, I started thinking I might polish one of them off."
Getty / Ian Gavan / UK Press / Mark Cuthbert
Tom Felton (Draco Malfoy)
Fun fact: Tom Felton's girlfriend, Jade Olivia, played Draco's wife Astoria in the film, but required some "arm twisting" by Felton to take the part.
UK Press / Justin Goff / Getty Images / Ian Gavan