Because you like Amy Pond in Doctor Who

Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.

With an abundant supply of alcohol, nice restaurants, and free will, Crowley is a demon who is thoroughly enjoying his time on Earth. See them in Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.

Frodo might have carried the ring, but Samwise Gamgee carried the ring bearer. See them in The Lord of the Rings.

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

Effie Trinket is utterly enamored with all things fashion, make-up, and style. See them in The Hunger Games .

Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.

A no-nonsense pro, Agent K has dedicated his whole life to his job. See them in Men in Black.

Donatello might come off as a tad nerdy, but don't let his geekiness fool you. He's a trained ninja and a skilled fighter. See them in Teenage Mutant Ninja Turtles.

In a rag-tag group of kids determined to take down the imperialistic Fire Lord, Katara is the glue that holds them together. See them in Avatar: The Last Airbender.

A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.