Because you like Slartibartfast in The Hitchhiker's Guide to the Galaxy
Suzy Bishop is only 12, but her withering stare and withdrawn personality are enough to make anyone wilt. See them in Moonrise Kingdom.
Hawkeye Pierce is a Devil-may-care Army doc who'd have the Devil laughing and drinking in five minutes flat. See them in M*A*S*H.
Introspective Theodore Twombly would rather observe life than participate in it. See them in Her.
Seth is short-tempered, crude, and terrible at school, but hopefully there's nothing an epic party can't fix. See them in Superbad.
Sylar's victims are found all over the country, many with their brains removed. See them in Heroes.
It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.
Nick Miller might not have a bank account, but he defintely has a lot of love to give. See them in New Girl.
An alien living in a temple shaped like a giant woman, Pearl enjoys ballet, fencing, and using her magical spear. See them in Steven Universe.
Annie Walker can bake a beautiful cupcake, but everything else in her life is a mess. See them in Bridesmaids.
Meticulous Arthur is always prepared, but he may not be ready to be the point man in the criminal world of dream sharing. See them in Inception.
A powerful mob boss, Vito Corleone is always making offers people can't refuse. See them in The Godfather.
The irrepressible Lucy Ricardo has never met a challenge she couldn't scheme her way into or out of. See them in I Love Lucy.