Because you like Leonard "Bones" McCoy in Star Trek

Aslan represents everything good and just, he's just not super reliable. See them in The Chronicles of Narnia.

Rick Dalton is an aging actor with insecurity issues. See them in Once Upon a Time in Hollywood.

Give in to the dark side with vampire Lestat; it's more fun. See them in Interview with the Vampire: The Vampire Chronicles.

Philip J. Fry accidentally cryogenically froze himself for a millennium. See them in Futurama.

There is never a dull moment with Jim Moriarty: expect booze and sing alongs in between all of the homicide. See them in Sherlock.

Margaery Tyrell is one of the most adept and charming liars there is. See them in Game of Thrones.

A powerful priestess, Melisandre is shrouded in mystery and lots of red. See them in Game of Thrones.

Guillermo is the best servant a vampire could ask for. For years now. Not that he's counting. See them in What We Do In The Shadows.

Michael Scofield is no criminal, and he didn't get jailed by accident. See them in Prison Break.

Patrick's time as a fake psychic made him a master manipulator. But he now seeks to only use his talent for good. See them in The Mentalist.

Eddie Brock is a big-hearted investigative journalist who is going through the world's weirdest identity crisis. See them in Venom.

GLaDOS will supply the food when you get together: a delicious cake. Of course, it could just be a trap so she can kill you. It’s hard to say. See them in Portal Series.