Ahh, a good chance to make my own fatalities. I don't want anything too over the top, but I wanna be brutal!

Breaking a neck isn't all that easy, they make it look like just a flick of the wrist in the movies. Granted if you have some cyborg arms then it should be easy to punch a hole into someone's skull as well as break the neck. I want gritty brutal moves, kind of like in The Last of Us.
Fatality 1: Left shin to the head which dazes, followed by right shin to the head which makes them stumble to the side, if they go down then knee right knee into the face until their face is nothing but a bloody mess.
Fatality 2: Both thumbs pressed into eyes and the back of their head smashed into either a wall or the floor, either one will do the job.
Fatality 3: Head butt to the nose followed straight up by a bite to the neck, spit out the flesh and dig your fingers into the wound, try opening it up to make them bleed faster.
Fatality 4: Fist to the neck, grab their head and bring it low enough to send your knee into their nose or mouth, either breaking their nose or their teeth, at the very least loosening a few. If needed, send your knee into their face again until they go down, and then stomp on their head until they're completely still.
Fatality 5: From behind, slam your knife in just above their collar bone and bring the knife across just to make sure they stay dead.
Fatality 6: When down or crouched in front of an enemy, slam your knife into their knee or thigh, send your fist into their balls or gut if they don't have any, and tackle them down to the ground and beat their face in until fully satisfied.
Fatality 7: From the side, slip your knife in where their rib cage ends, pull the blade out and step around so you're facing them, and slip your blade straight into their throat.
Fatality 8: Start off facing them, and slash horizontally towards their eyes using a reverse knife grip. Without hesitation, grab the back of their head, pull them close and send that knife down into their shoulder, collar bone, anywhere you can get to until they go down. Not elegant but it'll kill.