Because you like Seven of Nine in Star Trek: Voyager
Sheldon Cooper is brilliant in every way except, well, interacting with any human being. See them in The Big Bang Theory.
There is never a dull moment with Jim Moriarty: expect booze and sing alongs in between all of the homicide. See them in Sherlock.
It is a truth universally acknowledged that Elizabeth Bennet doesn't suffer fools or prideful men. See them in Pride & Prejudice.
Christian Grey is just as controlling in the bedroom as the boardroom. See them in Fifty Shades of Grey.
Number Five is a 58-year-old man trapped in his 13-year-old body. See them in The Umbrella Academy.
Daria Morgendorffer is so defensive that she actively works to make people dislike her so that she don't feel bad when they do. See them in Daria.
Bridget Jones is a wanton sex goddess, struggling 30-something, and semi-hot mess. See them in Bridget Jones's Diary.
It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.
A suave demon, Crowley grants humans their wishes in exchange for their soul, only to find loopholes that benefit him. See them in Supernatural.
If Lisbeth Salander can hurt a bastard who deserves it by digging up stuff about him, she feels good. See them in The Girl with the Dragon Tattoo.
A hurricane of a human being, Marla Singer is destructive and unforgettable. See them in Fight Club.