Because you like Nina Sayer in Black Swan
Genetically and cybernetically enhanced, Gamora was trained from birth to be one of the deadliest women in the galaxy. See them in Marvel Cinematic Universe.
Jin Kazama is a fearsome warrior torn between the darkness and the light. See them in Tekken .
Rupert Giles is a librarian on the outside, fearless evil-fighter on the inside. See them in Buffy the Vampire Slayer.
Charles Boyle is the human equivalent of a puppy, only slightly less adorable. See them in Brooklyn Nine-Nine.
Jesse Tuck dreams of finding someone to join his unusual family. See them in Tuck Everlasting.
James Gordon happens to be the one guy in Gotham City with proper morals who doesn't also run around in a cape. See them in DC Extended Universe.
Funny, self-destructive, and in her own head, Fleabag has spent most of her adult life using sex to deflect from the screaming void inside her empty heart. See them in Fleabag.
After years of being a nerdy loner, Seth Cohen can't wait to shower charm on his newfound friends. See them in The O.C..
A precocious 11-year-old, Satsuki Kusakabe is not quite as grown up as she pretends to be. See them in My Neighbor Totoro.
Lily Aldrin is a flaky but supportive kindergarten teacher and painter. See them in How I Met Your Mother.
Louise Belcher might be just a kid, but she can manipulate just about anyone with a pulse. All in the name of fun, of course. See them in Bob's Burgers.