Because you like Martha Jones in Doctor Who

Ellie is more world-weary than most 14-year-olds. You would be too if your world was infested with zombies. See them in The Last of Us.

A soulful bass player, Nick O'Leary can't stop sending breakup CDs to his ex. See them in Nick and Norah's Infinite Playlist.

Brian Griffin is the most scholarly member of the family—when he's not drunk on martinis. See them in Family Guy.

Dory is more than a little forgetful, but she'll always remember to have your back. See them in Finding Nemo.

With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.

Steven Universe is an excitable youth who likes junk food and trying to save the world. See them in Steven Universe.

Hiccup Haddock III may be the only Viking nerd in recorded history. See them in How to Train Your Dragon.

John Bender's interests include marijuana, fighting, and breaking the rules. See them in The Breakfast Club.

Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.

A secret smoker, Margot Tenenbaum has plenty more secrets where that came from. See them in The Royal Tenenbaums.

Because of Miles Edgeworth, the truth will always make itself known. See them in Ace Attorney Series .

Unaware of the fact that he's a toy and made of plastic, Buzz Lightyear is a spaceman on a mission fully of snappy catch phrases. See them in Toy Story.