Because you like Hero Boy in The Polar Express

Raven Reyes may be a deliquent, but she's also the youngest zero-gravity mechanic who fixed a 130-year old escape pod to make it through the descent to Earth. See them in The 100.

Donna is boisterous and spunky traveller of the TARDIS, exploring worlds beyond the simple mundane enterprises of Earth. See them in Doctor Who.

Ted Mosby is a hopelessly romantic architect in search of someone to be the mother of his children. See them in How I Met Your Mother.

Steve Stifler is more than just a dude with a hot mom. He's also rude, profane, and obnoxious. See them in American Pie.

Duck, girl, and legend: Ahiru's identities confuse even herself at times, and she often wonders which of them is truly her. See them in Princess Tutu.

John Locke is an eerily calm, confident believer in the magic of the island that gave him his legs back. See them in Lost.

Philip J. Fry accidentally cryogenically froze himself for a millennium. See them in Futurama.

Roger is a pansexual alcoholic non-human who will happily lie, cheat and steal to get what he wants. See them in American Dad!.

Cady Heron is the new girl in town who's also new to the world of high school, period. See them in Mean Girls.

Andy Dwyer might not be completely literate, but he makes up for it in spirit. See them in Parks and Recreation.

Milo Thatch is an enthusiastic researcher without cynicism. See them in Atlantis: The Lost Empire.