Because you like James T. Kirk in Star Trek
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
Marv is a brutish but principled thug who'd be right at home on an ancient battlefield. See them in Sin City.
A good-natured and academically minded superhero, Dan Dreiberg can still get his hands dirty in a fight. See them in Watchmen.
A conflicted small-town preacher, Jesse Custer leaves an unexpectedly bloody path in his wake. See them in Preacher.
Jack Bauer is a terrorist fighter who is scared of nothing and no one. The clock is ticking! See them in 24.
Ellen Ripley defines the word "badass." When she's not leading her crew on an interstellar voyage, she's slaying terrifying creatures. See them in Alien.
Lois Lane's journalistic success is the result of her tenacity. She will doggedly pursue her leads until discovering the information she needs. See them in DC Extended Universe.
If this slick ad man doesn't like the conversation, he changes it—while drinking and smoking. See them in Mad Men.
Sylar's victims are found all over the country, many with their brains removed. See them in Heroes.
Vengeance is William Wallace’s game. With his father, brother, and wife killed by the English, he slaughters the garrison and sacks cities. See them in Braveheart.