Because you like Ender Wiggin in Ender's Game
You couldn't ask for a better, or weirder, daughter like Cassie. See them in Marvel Cinematic Universe.
A Wakandan spy, Nakia is capable, caring, and just the right amount of stubborn. See them in Marvel Cinematic Universe.
Bodhi Rook is a defected pilot for the Galactic Empire dead set on destroying the Death Star. See them in Rogue One.
People make more sense to the hyper-logical Temperance Brennan after they're dead. See them in Bones.
Abbi Abrams is the ultimate wingwoman because she wants nothing more than to have a good time for its own sake. See them in Broad City.
Damon Salvatore used to miss being human. Now he can't think of anything more miserable. See them in The Vampire Diaries.
Dolores Umbridge keeps her villainy hidden (albeit poorly) behind a sheen of sugary pink politeness. See them in Harry Potter Series.
A reclusive introvert, Liz Sherman has a temper that's literally lethal. See them in Hellboy.
Helena is a mentally unstable, childish, and completely merciless. And most of all, she's an unstoppable killer. See them in Orphan Black.