Because you like Alphonse Elric in Fullmetal Alchemist
Bart Simpson is an aspiring juvenile delinquent who doesn't want you to have a cow, man! See them in The Simpsons.
Eponine is a scrappy street urchin with a bad case of unrequited love. See them in Les Miserables.
David Nolan is a noble fairy tale prince with the heart of a hero, regardless of whether he can remember his past or not. See them in Once Upon a Time.
George Costanza is short, stocky, bald, neurotic, and the self-proclaimed "king of the idiots." See them in Seinfeld.
Velma Dinkley is all about getting results, not taking credit. She is the unsung hero of Mystery Inc. See them in Scooby-Doo.
John Locke is an eerily calm, confident believer in the magic of the island that gave him his legs back. See them in Lost.
Beneath Arthur's brash demeanor lurks the heart of a compassionate future king destined to unite the five kingdoms. See them in Merlin.
Mr. Fox will never truly be happy without a dead chicken between his chompers. See them in Fantastic Mr. Fox.
While Alan Garner is loyal to his new friends, his efforts to help them often do more harm than good. See them in The Hangover.
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Cynicism is his armor and words are his weapons, but what Tyrion Lannister would really like is some nice wine. See them in Game of Thrones.