Because you like Lucy Pevensie in The Chronicles of Narnia
Whatever Sakura Haruno lacks in power, she makes up for in intelligence and bravery. See them in Naruto.
Aang is already a master airbender and once he learns to manipulate water, earth, and fire, he'll be truly unbeatable. See them in Avatar: The Last Airbender.
Eponine is a scrappy street urchin with a bad case of unrequited love. See them in Les Miserables.
The vampire that killed Zero Kiryu's family also infected him, and he starts to crave blood, much to his horror. See them in Vampire Knight.
In his transformation from hardened convict to moral paragon, Jean Valjean is the kind of man we should all aspire to be. See them in Les Miserables.
A few millennia in the mortal realm have caused DEATH to be quite enamored of life. See them in Discworld.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
While Jay Gatsby doesn't necessarily like to attend his parties, he knows how to throw a world-class bash. See them in The Great Gatsby.
Both intelligent and empathetic, Remus Lupin is worn down by the weight of a secret. See them in Harry Potter Series.
Charlie Kelmeckis is a wallflower who's starting to blossom into something more. See them in The Perks of Being a Wallflower.
WALL-E is a quirky little romantic robot cleaning the wasteland known as Earth. See them in WALL-E.
