Because you like Jerry Dandridge in Fright Night
His murderous megalomania aside, Loki is quite charming. Just don't mention his strapping older brother; he's a tad jealous. See them in Marvel Cinematic Universe.
Shaun is used to being lazy. And now, you're asking him to fight for his life? See them in Shaun of the Dead.
After Otto Octavius' accident, he becomes fixated on finishing the reactor at any cost. See them in Marvel Cinematic Universe.
V is a violent anarchist with literally nothing left to lose. But, he might have a point. See them in V for Vendetta.
In love with a daughter of his family's sworn enemies, Romeo Montague must find a way to reconcile his conflicting desires. See them in Romeo & Juliet.
Spencer Reid's super-smarts helps catch killers, and his social awkwardness endears co-workers. See them in Criminal Minds.
He's a troubled insomniac in search of a moment to rest and a meaning to his existence. See them in Fight Club.
James T. Kirk is more than ready to face the final frontier. See them in Star Trek.
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.
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.