Because you like Quasimodo in The Hunchback of Notre Dame
Bella Swan thinks of it as her job to help her parents and protect her friends, even though it often ends up the other way around. See them in Twilight.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
Holden Caulfield is convinced that the whole adult world is full of phonies. See them in The Catcher in the Rye.
Courteous, dangerous, and powerful, Kaname Kuran controls an entire court of vampires. Very, very pretty vampires. See them in Vampire Knight.
The ever-cheerful Tonks can change her appearance at will, but she can't seem to get rid of her clumsiness. See them in Harry Potter Series.
As the hero of time, Link is reborn throughout history, always with the purpose of fighting and defeating the evil Ganon. See them in The Legend of Zelda.
Juno MacGuff is hoping sarcasm will get her through the stress of teenage life. And also, teenage pregnancy. See them in Juno.
There's magic behind Tara Maclay's quiet façade. See them in Buffy the Vampire Slayer.
Tobias "Four" Eaton is only afraid of four things, but you should probably be afraid of him. See them in Divergent.