Because you like Donna Noble in Doctor Who

Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.

Carolos has perfect hair, a lab coat, and a constant readiness to do science. See them in Welcome to Night Vale.

As a doctor-in-training, John Dorian should have his head in the game. But most of the time, it's in the clouds. See them in Scrubs.

Tina Goldstein is better at getting the job done than following the rules. See them in Fantastic Beasts and Where To Find Them.

A charming acapella performer, Jesse Swanson perfectly blends being nerdy with being cool. See them in Pitch Perfect.

Darcy Lewis is a razor-sharp scientist studying things that science can't explain. See them in Thor.

Success for Eggsy Unwin means joining Kingsman, and failure could mean death. See them in Kingsman: The Secret Service.

Christian is a romantic who for some reason won't stop singing everything he feels. See them in Moulin Rouge.

Cisco Ramon is a proud, enthusiastic member of a superhero support team. See them in DC Extended Universe.

The Genie is the perfect buddy, granting every wish we might have and keeping life good-spirited. See them in Aladdin.

Anya Jenkins has a real harsh bark to go with her demonic bite. See them in Buffy the Vampire Slayer.

Relentlessly cheerful and optimistic, Erin Hannon is an office receptionist. See them in The Office.