Katniss Everdeen from The Hunger Games (by Suzanne Collins)
The main character and narrator of the story. Katniss is slender with black hair, grey eyes and olive skin. She is sixteen years old and attends a secondary school somewhere in Appalachia, known in the book as District 12, the coal mining sector. She is often quiet and is generally liked by District 12’s residents, mostly because of her ability to provide highly-prized game for a community in which starvation is a constant threat. Katniss is an excellent hunter, archer, gatherer, and trapper, skilled just like her deceased father. She and her father shared singing ability, too. Since his death in a mine explosion, which killed Gale’s father too, Katniss has been the sole provider for her family, a role she was reluctantly forced to assume at the age of eleven when her mother’s grief overcame her ability to function. Katniss is surprised when her sister is chosen to compete in the Hunger Games, and willingly steps forward to take her place out of love.
Katsa from Graceling (by Kristin cashore)
Karana from Island of the Blue Dolphins (by Scott O’Dell)
Kaya from Meet Kaya: An American Girl (by Janet Beeler Shaw)
Kaya dreams of racing her beautiful mare Steps High. Her father warns her that the horse isn’t ready, but when a pesky boy insults Steps High, Kaya accepts his challenge to race. As they ride, Kaya loses sight of her little brothers. Her carelessness earns her a nickname that her friends won’t let her forget.
Kathleen “Kitty” Jones from The Golem’s Eye (by Jonathan Stroud)
[Kitty is basically the ultimate badass with a heartwrenching backstory. At first, you want to hate her, but then you believe her cause is 100% worth it and all of a sudden you see how awesome she is. Plus, she’s resistant to magic, which comes in handy when fighting magicians. She’s very resourceful]
Kanaya from Homestuck (webcomic by Andrew Hussie)
Descriptions provided by Goodreads.  = blogger’s note.