Here is mine: My Khajit Assassin/Renowned Thief/Werewolf/Bada** of the century, Rashken.
He would first sneak up behind the person and take his dual wielding daggers and cross slice their neck, spurting blood everywhere. Next he would stab his claws through the back of his neck and stick it up and rip his eyeballs backwards out of his eye-sockets and backwards through the back of the neck. Then kicking him down so he would fall onto his torn out face. My Khajit would then transform into werewolf form and rip up everything on his back and tear out his heart, eating it messily and spitting it out onto the rotten corpse.
Jirek: Paladin
First Fatality: Divine Judgement
Jirek Pulls out Auri-El's Bow and Fire a Sunhallowed Arrow into his opponents chest, he then kneels and prays to the divines, the arrow begins to glow brighter until a large beam of scorching sunlight burns the enemy to a charred crisp.
Second Fatality: Divine Embrace
Jirek casts flame cloak on himself and proceeds to embrace his opponent, while the flames of the cloak melt his skin and clothing away to just a skeleton. Jirek looks up from hugging his opponent to see the just a skeleton, shrugs, and lets the bones fall to the ground.
Friendship: This little light of mine.
Jirek uses divine sunlight to light a candle, he produces a second candle, puts it in his opponents hand, and lights it with his candle.
I can't play evil characters, every time I try they turn out awful. Jirek's attitude is overwhelming positivity and he's a hero of the people for his warmth and sense of justice, so I wanted his fatalities to reflect his devotion to the divines and his happy nature.
My character's fatality would be:
A Soul Trap infused Icy Spear aimed at the enemies heart goes straight through and my character would place a black soul gem where the heart was. Then he'd pick up the heart and eat it right on the zombies face. (Because of the Black Soul Gem the soul never left the body, it's just there watching and not able to do anything.) :)