Because you like Hans Gruber in Die Hard
Deadpool thinks life is an endless series of train wrecks with only brief commercial-like breaks of happiness. See them in Deadpool.
Roger is a pansexual alcoholic non-human who will happily lie, cheat and steal to get what he wants. See them in American Dad!.
Ethan Hunt's mission, should he chose to accept it, is to save the world from impossible threats. See them in Mission: Impossible.
Nick Miller might not have a bank account, but he defintely has a lot of love to give. See them in New Girl.
Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.
Innately shy, Ginny Weasley is growing into a feisty, independent spirit. See them in Harry Potter Series.
An inter-dimensional demon, Bill Cipher dreams of a more chaotic Gravity Falls. See them in Gravity Falls.
Aimee Finecky has big dreams, but she's too busy taking care of everyone else's desires. See them in The Spectacular Now.
Kyoya Ootori is possibly the only person who could reasonably go from VP of a school club to ruling the world. See them in Ouran High School Host Club.
The crown prince of the Fire Nation, Zuko has been ordered by his father to find the long-lost Avatar before he is allowed to return home. See them in Avatar: The Last Airbender.