Because you like Anya Jenkins in Buffy the Vampire Slayer
Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.
Often on the verge of a nervous breakdown, Annie Edison nevertheless manages to be the brain of the Greendale study group. See them in Community.
A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.
Lily Aldrin is a flaky but supportive kindergarten teacher and painter. See them in How I Met Your Mother.
Don't tell anyone Kate Austen was under arrest when the plane crashed. See them in Lost.
Darcy Lewis is a razor-sharp scientist studying things that science can't explain. See them in Thor.
Chef is a swinging bachelor and former R&B singer with a leopard-skin upholstered couch and some great stories. See them in South Park.
Helena is a mentally unstable, childish, and completely merciless. And most of all, she's an unstoppable killer. See them in Orphan Black.
Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.
Part archaeologist, part philosopher, part politician, Jean-Luc Picard is an unashamed intellectual who runs a tight ship. See them in Star Trek: The Next Generation.
A sarcastic and nosy tomboy, Stephanie Tanner is understandably not crazy about being the middle child. See them in Full House.