Because you like Ellen Ripley in Alien

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

Michael Kelso gets by on his good looks and his openhearted nature. See them in That '70s Show.

Tony Stark's interests include cocktails, beautiful women, particle physics, and saving the world. See them in Marvel Cinematic Universe.

A benevolent madman with a blue box, The Doctor is traveling through time and space to heal the wounds of the universe. See them in Doctor Who.

Morticia Addams hates anything bright and cheery and loves all things ghoulish, ghastly, and violent. See them in The Addams Family.

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

Dutiful, composed, and aloof, Sun Bak is the fighting force behind her team of eight "sensates" who are telepathically linked. See them in Sense8.

Frank Reynolds is too gross even for the prostitutes he hires. See them in It's Always Sunny in Philadelphia .

Macbeth was probably named "Most Likely to Kill His Rivals" in his senior yearbook. See them in Macbeth.

Andy Dwyer might not be completely literate, but he makes up for it in spirit. See them in Parks and Recreation.