Because you like Ender Wiggin in Ender's Game
The only thing standing between Rocky Balboa and glory is the person facing him in the boxing ring. See them in Rocky Series.
For Sly Cooper, stealing isn't just about the haul. It's also about the journey. See them in Sly Cooper.
Angel is fighting as best as he can, but the disease might be too powerful for even his strong, positive energy. See them in Rent.
Sookie Stackhouse is a waitress who can read minds and break hearts. See them in True Blood.
Ezio Auditore Da Firenze is a little short-tempered, a lot fun-loving. See them in Assassin's Creed Series.
Nemo is a small fish in a vast ocean, but he dreams of seeing it all. See them in Finding Nemo.
If Lisbeth Salander can hurt a bastard who deserves it by digging up stuff about him, she feels good. See them in The Girl with the Dragon Tattoo.
Where Ash comes from, food and shelter pay for themselves. Even as a penniless vagrant, he is able to pursue his dream of becoming a Pokémon Master See them in Pokemon.
Veronica Lodge is a sophisticated girl who always, no matter what, absolutely gets what she wants. See them in Archie Comics.
Po is a clumsy, friendly panda who likes to take it easy. But now he's expected to save the world? See them in Kung Fu Panda.
Yuki Cross is a cheerful, funny, bold young woman with hidden insecurities. See them in Vampire Knight.
Yes, she's an "older" woman, but that just makes Mrs. Robinson sexier and more seductive. See them in The Graduate.