Because you like Mary in About Time

How is angel Aziraphale supposed to stop the apocalypse when Hell's forces misplaced the Antichrist somewhere? See them in Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.

Raised to happily follow the rules, Cassia might actually be more rebellious than she thinks she is. See them in Matched .

Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.

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.

Emmet Brickowski is so upbeat it's not even human. Everything is AWESOME! See them in The Lego Movie.

Although Mako Mori may be small and quiet, she is a core of battle-hardened steel. See them in Pacific Rim.

Spike is punk meets vampire meets romantic poet. See them in Buffy the Vampire Slayer.

With an A.I. as loyal and witty as Cortana, who needs humans? See them in Halo.

Impassive, overly literal, and a little short on people skills, Angel dedicates her life to enforcing the rules. See them in Angel Beats!.

Shrek is a nasty-on-the-surface ogre with a heart of gold and an earful of wax. See them in Shrek.

Everyone Barney Stinson knows is getting married or pregnant. But he's just getting more awesome. See them in How I Met Your Mother.

Steven Universe is an excitable youth who likes junk food and trying to save the world. See them in Steven Universe.