anyone with something sharp (probably kano, kung lao, or kitana): they should slit your throat and reach into you neck and rip out your spine. they should rip it out in a few pieces rather than all in 1 piece, getting blood on both of their hands.
cyax should shoot a net at you with a bunch of bombs in it and when you get trapped in the net it goes boom and you blow up into pieces.
johnny cage should first do his groin punch, then he should do like a super powered version of his shadow kick, kicking your head into pieces.
even though this kinda is jax's fatality sorta, i would like to see sub-zero do the head squash with his fists, only this time sub makes giant blocks of ice with his hands and squashes their head with them.