Because you like Butthead in Beavis and Butthead
Leonard Hofstadter is the normal one among his scientist friends, though in fairness that's a low bar. See them in The Big Bang Theory.
Foul mouthed and disturbingly comfortable with violence, Hit-Girl is a precocious assassin who doesn't need anyone's protection. See them in Kick-Ass.
Moana is brave, adventurous, and dutiful. And with the ocean on her side, there's no telling how far she'll go. See them in Moana.
When push comes to shove, the usually overly cautious Luigi has the heart of a hero. See them in Super Mario Bros..
An aristocrat-turned-tomb-raider, Lara Croft does her best thinking while plunging off cliffs. See them in Lara Croft: Tomb Raider.
A master manipulator, Frank Underwood has a tight grip on Washington DC. Plus who doesn't like having a leader who frequently tosses off Shakespearean asides? See them in House of Cards.
Nothing inspires dread like the mysterious, masked Man in Black. But what's he hiding? See them in The Princess Bride.
Fiery and adventurous, Amy Pond is the sort of woman you'd want by your side on a journey through time and space. See them in Doctor Who.
Megamind is searching for purpose in a supervillain life without a superhero to fight. See them in Megamind.
Tiana lives by a simple motto: "Fairy tales can come true. But you gotta make them happen, it all depends on you." See them in The Princess and the Frog.
If you hang out with Bender in cool dive bars in 31st century New York, make sure you're on his "Do Not Kill" list. See them in Futurama.