Because you like Ianto Jones in Torchwood

Jenny Flint is a devoted wife and daring crime fighter, which is pretty unconventional for a Victorian maid. See them in Doctor Who.

This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.

A dedicated hedonist, Jack Harkness appreciates raunchy stories, stiff drinks, and excellent bottoms. See them in Doctor Who.

A Silurian lizard woman, Madame Vastra has a penchant for puzzles and interspecies romance. See them in Doctor Who.

A compassionate medical student, Martha Jones has found a Doctor she can really look up to. See them in Doctor Who.

Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.

Ted Logan wants to party on, but if doesn't get an A+ on his history presentation, he'll flunk out and be sent to a military school in Alaska. See them in Bill & Ted's Excellent Adventure.

Emma Frost's superpower: transforming her body into an unbreakable diamond. See them in X-Men Series.

Michael Bluth is the only sane person in a family of eccentrics. At least, that's how he thinks of himself. See them in Arrested Development.

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

There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.

Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.