Because you like Rose Tyler in Doctor Who

Ianto Jones' withdrawn nature conceals his emotional pain. See them in Torchwood.

A formerly righteous wizard, Saruman has been corrupted by the forces of evil. See them in The Lord of the Rings.

There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.

Greg Lestrade is gruff, loyal, and quietly competent. See them in Sherlock.

Detective Alec Hardy doesn't let anyone get too close to him. See them in Broadchurch.

Remy Hadley is a closed book—a cynical, super-smart closed book. See them in House M.D..

Kate Beckett is a no-nonsense policewoman with a nerdy side. See them in Castle.

James Gordon happens to be the one guy in Gotham City with proper morals who doesn't also run around in a cape. See them in DC Extended Universe.

Emma Frost's superpower: transforming her body into an unbreakable diamond. See them in X-Men Series.

Kilgrave is a domineering, abusive boyfriend. Then, add in the power of mind control. See them in Marvel Cinematic Universe.

Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.

On the outside, Gwen seems meek and calm. But she has an inner core of steel. See them in Merlin.