Because you like Cortana in Halo

Don't ask Rosa Diaz, a Brooklyn detective, to lighten up. Actually, to be safe, don't ask her to do anything! See them in Brooklyn Nine-Nine.

When Andrew Neiman is not in classes during the day, he's rehearsing his drums until his hands bleed at night. See them in Whiplash.

England may cultivate the image of a well-bred gentleman, but he has both the temper and mouth of a seasoned sailor. See them in Axis Powers Hetalia.

After alien Haruko rides in on her Vespa, giant robots spouting from Naota Nandaba's forehead soon become the least of his worries. See them in FLCL.

A blood-thirsty warrior on the battlefield, Ragnar Lothbrok is a dedicated family-man at home. See them in Vikings.

Bucky Barnes used to be a good-hearted American soldier. Now he's the cold-hearted Winter Soldier. See them in Marvel Cinematic Universe.

Riley Blue is trying to outrun her bad luck, but she might not be fast enough. See them in Sense8.

A confident celebrity, Allison Hargreeves wasn't quite careful enough about what she wished for. See them in The Umbrella Academy.

Drusilla's hobbies include dolls, music, and killing people. See them in Buffy the Vampire Slayer.

In the simplest terms, in the most convenient definitions, people consider Brian a nerd. But he's more than that. See them in The Breakfast Club.

Titus Andromedon will show you the ropes, help you with your problems, and sing at you constantly, whether you like it or not. See them in Unbreakable Kimmy Schmidt.

As a psychokinetic who was raised in a lab, Eleven is finding Indiana to be a scary world. But at least she's discovered Eggo waffles. See them in Stranger Things.