Because you like James T. Kirk in Star Trek
Fox Mulder is a devoted believer in aliens, monsters, and that the truth is out there. See them in The X-Files.
Kara "Starbuck" Thrace will beat you in cards, drink you under the table, then fly circles around you in her fighter plane. See them in Battlestar Galactica.
Hawkeye Pierce is a Devil-may-care Army doc who'd have the Devil laughing and drinking in five minutes flat. See them in M*A*S*H.
Part archaeologist, part philosopher, part politician, Jean-Luc Picard is an unashamed intellectual who runs a tight ship. See them in Star Trek: The Next Generation.
A ruthless militant, Raza will do anything to take down Tony Stark. See them in Marvel Cinematic Universe.
For Dana Scully, sometimes looking for extreme possibilities makes you blind to the probable explanation right in front of you. See them in The X-Files.
Told her son will one day save the world, Sarah Connor dedicates her life to training him to do just that. See them in The Terminator.
More of a sex symbol than a crime-stopper, the original Silk Spectre has now become the ultimate superhero stage mom. See them in Watchmen.
Although Mako Mori may be small and quiet, she is a core of battle-hardened steel. See them in Pacific Rim.
World domination and Superman's demise are next on Lex Luthor's to-do list. See them in DC Extended Universe.
Ethan Hunt's mission, should he chose to accept it, is to save the world from impossible threats. See them in Mission: Impossible.