Because you like Josh Lucas in Clueless
Steve Rogers is a good soldier. But above all, he's a good man. See them in Marvel Cinematic Universe.
Princess-turned-General Leia Organa is a sharp, fearless royal who gets herself into trouble and fights her way out of it. See them in Star Wars Series.
Fox Mulder is a devoted believer in aliens, monsters, and that the truth is out there. See them in The X-Files.
Dominic Toretto lives his life "a quarter mile at a time", and he burns through those miles faster than anyone. See them in The Fast and the Furious.
The Warden of the camp says that digging holes in the desert builds character, but Stanley Yelnats suspects there's more to it. See them in Holes.
Gruff and sarcastic, Detective Harry Dresden use unconventional ways to track down perps, including using magic and the supernatural. See them in The Dresden Files.
The adventurous daughter of Port Royal's governor, Elizabeth Swann would rather conspire with pirates than sit pretty in her corset. See them in Pirates of the Caribbean: the Curse of the Black Pearl.
Brilliant, violent, and only a little insane, the Joker doesn't listen to anyone except the voices in his head. See them in DC Extended Universe.
Make sure not to anger the Hulk or else he will transform into a giant green monstrosity and smash anything in his way. See them in Marvel Cinematic Universe.
Beware! Anton Chigurh carries a coin with him, which he forces his victims to flip to decide whether they will live or die. See them in No Country for Old Men.