Because you like Susan Pevensie in The Chronicles of Narnia

Dorothy Gale is a down-home Kansas girl in a bizarre fantasy land with beautiful red shoes. See them in The Wizard of Oz.

Milo Thatch is an enthusiastic researcher without cynicism. See them in Atlantis: The Lost Empire.

Christine Daae has been secretely taking lessons from a phantom musician. It sounded less creepy in her head. See them in The Phantom of the Opera.

A daughter of a pair of superheroes, Hope van Dyne is scientist is brilliant and fearsome. See them in Marvel Cinematic Universe.

Charlie Bucket may be down-on-his-luck, but his spirits are always sky high. See them in Charlie and the Chocolate Factory.

Sam Montgomery works hard, but her evil stepmother makes sure her efforts don't pay off. See them in A Cinderella Story.

Arwen has to choose between a life of loneliness or love and inevitible death, both rather unfortunate options. See them in The Lord of the Rings.

A singing nanny, Mary Poppins is practically perfect in every way. See them in Mary Poppins.

Bob Parr is an ex-superhero now focused on being a dad, but he misses the action. See them in The Incredibles.

Darcy Lewis is a razor-sharp scientist studying things that science can't explain. See them in Thor.

A majestic ruler, Mufasa is respected throughout the animal kingdom. See them in The Lion King.

James Gordon happens to be the one guy in Gotham City with proper morals who doesn't also run around in a cape. See them in DC Extended Universe.