Because you like Ford Prefect in The Hitchhiker's Guide to the Galaxy
After surviving a CIA mission that was supposed to kill him, ex-military man John Reese bets it all on a chance to redeem himself. See them in Person of Interest.
We're all puppets. Dr. Manhattan is just a puppet who can see the strings. See them in Watchmen.
Reckless, vulgar, loud-mouthed: that's what makes Amethyst so awesome. See them in Steven Universe.
Evan is a sensible kid, but being sensible isn't going to help him lose his virginity. See them in Superbad.
C is for cookie, and that's more than good enough for him. See them in Sesame Street.
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
With each reboot, Janet progresses more and becomes capable of human emotions. See them in The Good Place.
If Lisbeth Salander can hurt a bastard who deserves it by digging up stuff about him, she feels good. See them in The Girl with the Dragon Tattoo.
Rory Williams is a caring companion whose specialty is looking after others. See them in Doctor Who.
Gina Linetti views herself as a sort of life coach/influencer to the rest of the office. She's not so keen on the "work" aspect of her job. See them in Brooklyn Nine-Nine.