Hit-Girl (real name Mindy Macready) was raised by her father, Big Daddy, her mother being murdered by frustrated criminals. For an unnamed amount of time, Big Daddy has been training Hit-Girl to kill, allowing her to fight alongside him to avenge his wife's death by killing many criminals, ending with boss-man Johnny G. As a result of this, she has a high knowledge and interest of weapons. It is revealed in her diary that, because of their operation, Hit-Girl and her father move constantly, record time being six weeks.
Hit-Girl has been trained thoroughly by her father. She has been trained to take a bullet (with a bullet-proof-vest on, of course), fight hand-to-hand, fight with both blunt and bladed weapons, and she has been taught about guns, inventors of guns, and even action movies and action movie stars. This is presumed to exist only for her training purposes, because she has not yet been seen using guns. The nature of Hit-Girl's training has made her particularly brutal and remorseless in combat.
Although the advantage of costumes and nicknames are obvious, it appears that most of it is influenced heavily by her and her father's love of comics. It is even shown that the only reason Big Daddy agrees to join forces with Kick-Ass and The Red Mist is to entertain his daughter.
She wears an improvised superhero-style costume and wields a pair of katanas in combat. She carries a selection of small throwing blades. She is also very skillful in the use of a flamethrower. In the last two issues, she uses a pair of Glock 23 pistols to slaughter mobsters en masse.
Hit-Girl is a skilled and brutal fighter. Unlike most girls of her age she is very interested in weapons and can handle death well. She doesn't seem to be at all bothered by blood and guts. She also curses like a sailor and as previously mentioned likes Hello Kitty, comics and Clint Eastwood and John Woo movies.
http://www.comicvine.com/hit-girl/29-56881/
Jason Todd learned from the best.
While the details differ between the animated movie and the comic counterparts, the core of the character is the same. After Dick Grayson outgrew the Robin alter ego, Batman found a new apprentice in Jason Todd. While Jason did have exceptional agility and fighting skills, he differed from Grayson in his rebel mindset, often directly disobeying The Dark Knight's direction. They still proved to be an effective team until one night when the Joker managed to trap Jason in a warehouse and beat him nearly to death with a crowbar, before leaving him next to a ticking timebomb.
Batman raced to save Jason, but for once in his life, The Dark Knight was one-upped, and Jason was caught inside a catastrophic explosion.
Five years later, Jason returned as the masked Red Hood. While still possessing the fighting skill and guile learned from The World's Greatest Detective, Jason also learned to be very effective with blades and firearms. So in short you have an apprentice of Batman himself who is not afraid to use weapons or kill to accomplish his goal.
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