Because you like Ianto Jones in Torchwood
A Silurian lizard woman, Madame Vastra has a penchant for puzzles and interspecies romance. See them in Doctor Who.
How is angel Aziraphale supposed to stop the apocalypse when Hell's forces misplaced the Antichrist somewhere? See them in Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.
A dedicated hedonist, Jack Harkness appreciates raunchy stories, stiff drinks, and excellent bottoms. 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 compassionate medical student, Martha Jones has found a Doctor she can really look up to. See them in Doctor Who.
Donna is boisterous and spunky traveller of the TARDIS, exploring worlds beyond the simple mundane enterprises of Earth. See them in Doctor Who.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
A brilliant intelligence officer, Eve Polastri seems more like Bridget Jones than James Bond. See them in Killing Eve.
Tony Stonem is the golden boy of Bristol. Problem is, he knows it. See them in Skins.
There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.
Rose Tyler may have not done too well in school, but she's certainly holding her own in space. See them in Doctor Who.
Talos is a mysterious military commander skilled in the art of deception. See them in Captain Marvel.