Because you like Ford Prefect in The Hitchhiker's Guide to the Galaxy

Tina Goldstein is better at getting the job done than following the rules. See them in Fantastic Beasts and Where To Find Them.

Carolos has perfect hair, a lab coat, and a constant readiness to do science. See them in Welcome to Night Vale.

People make more sense to the hyper-logical Temperance Brennan after they're dead. See them in Bones.

Irene Adler has to use both her brains and her body to survive. Luckily, she's usually the most brilliant person in the room. See them in Sherlock.

It’s a shame that the Seven Kingdoms doesn’t allow a woman to rule. The scheming, focused Cersei Lannister would do a far better job than either of her sons. See them in Game of Thrones.

A legendary warrior with a complicated relationship to the truth, Jaime Lannister is revered and reviled in equal measure See them in Game of Thrones.

A Berlin-based locksmith by day, Wolfgang Bogdanow is a world-class thief by night. He can also see out of other people's eyes, but that's a different issue. See them in Sense8.

You won't like him when Bruce Banner is angry. See them in Marvel Cinematic Universe.

Rogue's touch is literally deadly, and she's trying to learn from the older mutants how to manager her powers. See them in X-Men Series.

Dorothy Gale is a down-home Kansas girl in a bizarre fantasy land with beautiful red shoes. See them in The Wizard of Oz.

The only constant in Night Vale is Cecil's hypnotic voice. See them in Welcome to Night Vale.

Often on the verge of a nervous breakdown, Annie Edison nevertheless manages to be the brain of the Greendale study group. See them in Community.