Because you like Caesar in Dawn of the Planet of the Apes
Although Jareth seems like he's just a harmless romantic, his powers make him a formidable foe. See them in Labyrinth.
This wizard is never late, nor is he early. Gandalf arrives precisely when he means to. See them in The Lord of the Rings.
Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .
Celie Johnson says she's poor, black, and may even be ugly. But dear God she's here. See them in The Color Purple.
Even the smallest person can change the course of the world, if he's brave enough. See them in The Lord of the Rings.
Meat Boy tenaciously throws himself into danger, and when he fails, he immediately gets back up and tries again. See them in Super Meat Boy.
Tracy Turnblad's got rhythm, and she's determined to share her dance moves with the world. See them in Hairspray.
Mario is a plumber who wears a ridiculous outfit, eats weird looking mushrooms, and fits himself inside your pipes so he can save a princess. See them in Super Mario Bros..
When a half-breed breaks the rules, John Constantine deports them straight back to hell. He's trying to buy his way into heaven. See them in Constantine.
John Tyree has survived heavy gunfire and aggressive enemy soldiers. But can he handle a girl? See them in Dear John.
When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.