Because you like Geordi La Forge in Star Trek: The Next Generation
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.
If you need her, Lisa Simpson will be in her room with her saxophone and a good book. See them in The Simpsons.
Belle has ready every storybook in town, and she's slowly realizing that life is no fairytale. See them in Beauty and the Beast.
While Alan Garner is loyal to his new friends, his efforts to help them often do more harm than good. See them in The Hangover.
A superpowered test subject, Scarlet Witch can manipulate other people's thoughts and force them to confront their worst fears. See them in Marvel Cinematic Universe.
Hiccup Haddock III may be the only Viking nerd in recorded history. See them in How to Train Your Dragon.
Joel is a hardened, jaded survivor who keeps finding things to fight for. See them in The Last of Us.
Irene Adler has to use both her brains and her body to survive. Luckily, she's usually the most brilliant person in the room. See them in Sherlock.
While Fantine's gentleness has led others to take advantage of her, it ultimately forces her to become stronger. See them in Les Miserables.
Everyone is just a chess piece, and Izaya Orihara is a master player. See them in Durarara!!.
Sally Albright is high maintenance who she thinks she's low maintenance. But she's still worth it. See them in When Harry Met Sally....