Because you like James P. Sullivan in Monsters, Inc.
Villanelle is a hired assassin who loves committing murder as much as she loves dressing up in fancy pink ballgowns. See them in Killing Eve.
You don't teach a class called "How To Get Away With Murder" without knowing a thing or two about getting away with things. See them in How to Get Away with Murder.
Don't worry about this forensic scientist offing you unless you're a serial killer yourself. (You're not, right? Just checking.) See them in Dexter.
A laid-back stoner, Ben Stone wasn't planning on life's ultimate responsibility. See them in Knocked Up.
Member of the student council, captain of the fencing team, and part-time model, Juri Arisugawa is idolized by everyone around her. See them in Revolutionary Girl Utena.
Smart and sensitive Sam Winchester tried to escape the family business, but ghosts have a way of haunting you. See them in Supernatural.
Did he ever tell you the definition of insanity? Just wait, and this psychopath will do just that. See them in Far Cry 3.
Stuck in space, Ryan Stone will either make it back to Earth and have one hell of a story to tell. Or she will burn into the ether. See them in Gravity.
Damon Salvatore used to miss being human. Now he can't think of anything more miserable. See them in The Vampire Diaries.
Michelle Richardson's world revolves around her boyfriend. Alas, his world doesn't revolve around her. See them in Skins.
Is there more to life than being really, really, ridiculously good looking? Derek Zoolander thinks not. See them in Zoolander.
Everyone Barney Stinson knows is getting married or pregnant. But he's just getting more awesome. See them in How I Met Your Mother.