While there were countless of thses created, I will admit that this is no different. But until the next tournament goes live, I'd like this thread to serve as database for the fatalities that people on the forums make up.
Here's mine.

Smoke-Puppet Master
Smoke gathers a ball of smoke into his hands and then launches it at his opponent. The ball explodes on contact, but does no physical damage to the opponent. Feeling releaved, the opponent takes a deep breath, inhaling the smoke. Smoke then closes his hand into a fist and the opponent starts coughing up blood. Smoke then makes a fist with his second hand and brings the both together. The opponent starts to scream in pain as their body is now out of their control. With ne swift tug towards his chest, Smoke extracts the person's skeleton through the front of their skin, tearing the flesh in two. The now bloody skeleton is screaming in horror and pain. Smoke then crosses his arms over each other and the skeleton crunches in on itself. Then Smoke quickly spereates his arms and the skeleton gets torn to pieces in opposite directions.

Sub-Zero-Chill Pill
Sub-Zero gathers his cryo-energy into his hands like a normal iceblast. This time however, he concentrates all of the blast into a small bite-size projectile. He then shoots it into the opponent's body. Sub-Zero then closes his fist and icicles begin to grow inside the opponent. The opponent grabs their stomach in pain. The icicles tear through their insides, and then shoot to the surface, tearing through the skin and limbs of the opponent. The icicles then expolde inside the opponent to enormous size, disconfiguring the opponent, impaling his inards on the now outward icicles. With their last breath, the opponent screams in pain, as an icicle shoot from out of itheir mouth, impaling them from the inside. In the end, all that is left is a giant ice star, with the opponents flesh hangin off the points.

Havik- Intestinal Mutilation
Havik cuts open his tomach with a ritualistic dagger. HIs intestines spill to the ground infront of him. Disgusted, the opponent starts to vomit. havik then chants something and his intestines come to life. They shoot at the vomiting opponent. As the opponent raises their head, their mouth is filled with Havik's intestines, now turned tendrils. The opponent tries to scream but is completely muffled. Their body is then raised to a standing position. The intestines dig through their flesh, two come out from the opponets palms, and two more out of their knees. The tendrils then lift the opponet into the air as they still try to get free. Suddenly, the opponet's stomach burst open as their insides are pushed out of thier flesh. The remaing tendrils grab the opening from the inside and pull in seperate directions, tearing the screaming corpse to pieces. They then return inside of Havik, and his cut is then healed....Fatality..

So these are a couple of mine. Feel free to add yours, and critique is appreciated.