Because you like Ken Masters in Street Fighter
Red doesn't like to explain herself. She wants her work to do the talking. See them in Transistor.
Wei Shen is an undercover cop on a mission for justice (or at least vengeance). See them in Sleeping Dogs.
For Sly Cooper, stealing isn't just about the haul. It's also about the journey. See them in Sly Cooper.
Iris West is a barista and blogger determined to expose a secret. See them in DC Extended Universe.
It's easy to see why Poe Dameron would side with the rebellion: he's bad at taking orders, likes to show off, and is committed to the cause. See them in Star Wars Series.
Javert is an inspector with a single-minded focus: to bring criminals to justice. See them in Les Miserables.
Handsome Jack is wearing a mask of his own face to hide his scarred real one. See them in Borderlands Series.
A Silurian lizard woman, Madame Vastra has a penchant for puzzles and interspecies romance. See them in Doctor Who.
Point the fun-loving Pippin Took towards second breakfast, and he's one happy hobbit. See them in The Lord of the Rings.
After Rintarou Okabe develops the Phone Microwave, some of his fantasies start to seem uncomfortably real. See them in Steins;Gate.