Because you like Lisbeth Salander in The Girl with the Dragon Tattoo
Tony Montana makes up for his language barrier with his immense skill at cursing as loud and effectively as humanly possible. See them in Scarface.
Eliot Waugh is the unspoken leader of his group of friends at a school for magic. See them in The Magicians.
James T. Kirk is more than ready to face the final frontier. See them in Star Trek.
Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.
Morticia Addams hates anything bright and cheery and loves all things ghoulish, ghastly, and violent. See them in The Addams Family.
The White Queen been treated horribly, but the day of her victory is almost near. See them in Alice in Wonderland.
The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.
A brave but pessimistic nobleman, Boromir knows one does not simply walk into Mordor. See them in The Lord of the Rings.
The only thing standing between Rocky Balboa and glory is the person facing him in the boxing ring. See them in Rocky Series.
Diana Prince is using a truth-telling lasso and super-strength to make Earth a little more like Paradise. See them in DC Extended Universe.