Because you like Spike in Buffy the Vampire Slayer
Kim Kelly is a high school bully who's normally in a bad mood. But there's a softer side to her. See them in Freaks and Geeks.
On the outside, Gwen seems meek and calm. But she has an inner core of steel. See them in Merlin.
With a brilliant mind, an insane level of confidence, and a penchant for drunken dancing, Cristina Yang is a force to be reckoned with. See them in Grey's Anatomy.
Juliet Starling is a cheerleader by day, gleefully unhinged zombie killer by night. See them in Lollipop Chainsaw.
Jorah Mormont is loyal to his queen. And he's quite in love with her as well. See them in Game of Thrones.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
David Nolan is a noble fairy tale prince with the heart of a hero, regardless of whether he can remember his past or not. See them in Once Upon a Time.
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Hiccup Haddock III may be the only Viking nerd in recorded history. See them in How to Train Your Dragon.
Noah Calhoun is lost without Allie, who seems to have moved on. See them in The Notebook.
A Silurian lizard woman, Madame Vastra has a penchant for puzzles and interspecies romance. See them in Doctor Who.