Because you like River Song in Doctor Who

When he's not working as a detective, Lucifer is driving around in a black convertible or having one-night stands. See them in Lucifer.

Nandor is a relentless vampire who never admits he's wrong, loves glitter, and can't use a tablet. See them in What We Do In The Shadows.

A consummate schemer with a knack for solving mysteries, Shawn Spencer has trouble taking anything seriously. See them in Psych.

A no-nonsense pro, Agent K has dedicated his whole life to his job. See them in Men in Black.

Jeff Winger thinks he's too cool for school, which is a problem because he just enrolled in community college. See them in Community.

Luke Danes will serve you coffee and always be there for you to help out. See them in Gilmore Girls.

Nate Archibald is confident, shrewd and trying to do the right thing. But that isn't always easy on the ruthless Upper East Side. See them in Gossip Girl.

Arwen has to choose between a life of loneliness or love and inevitible death, both rather unfortunate options. See them in The Lord of the Rings.

Simon Belmont is a vampire hunter bravely carrying on the family business. See them in Castlevania.

It's hard enough for Marta Cabrera to be part of a murder investigation, but when you can't lie? See them in Knives Out.

A suave demon, Crowley grants humans their wishes in exchange for their soul, only to find loopholes that benefit him. See them in Supernatural.