Disclaimers are in the prologue.
Nothing left to say here except have fun.
The Creeper had been told by Freddy to keep the others away at all costs until he'd had a chance to deal with Jason. Now, as the battle began, the Creeper knew who it wanted to fight: Pumpkinhead. This creature seemed intent on spilling Freddy's guts, and that was just not going to happen.
As the others attacked, the Creeper approached Pumpkinhead, teeth bared. Pumpkinhead whirled on the Creeper and roared. The Creeper screeched and the mandibles on his face spread out as he did so.
Pumpkinhead and the Creeper began to circle each other slowly, glaring at one another. After a few moments of this, Pumpkinhead squealed and moved to slash at the Creeper. The Creeper ducked it and spread his wings, spinning around quickly. The wings hit Pumpkinhead's ankles, and the beast was knocked to the ground.
The Creeper grinned and stood ready. Pumpkinhead jumped to his feet and ran at the Creeper, squealing madly. The Creeper was taken aback by this, and he had to grab Pumpkinhead's wrists to keep the claws off of him.
Pumpkinhead put his face close to the Creeper's and they shrieked at each other. Pumpkinhead leaned forward and bit into the Creeper's shoulder. The Creeper howled and released one of Pumpkinhead's hands, and produced a knife whose handle was made of bone, and whose blade was long and sharp. The knife had been hidden underneath a layer of skin.
He used the knife to slice Pumpkinhead's wrist, and the creature retreated slightly, screaming in pain. The Creeper looked over and saw that Freddy was about to be smashed by Jason. Acting quick, the Creeper spread his wings and flew straight for Freddy. Just before it was too late, the Creeper snatched Freddy up and dropped him off nearby. He quickly flew back towards Pumpkinhead.
Pumpkinhead watched the Creeper come and grabbed him by the neck as he tried to plow into him. Pumpkinhead lifted the struggling Creeper off the ground and shrieked in his face, preparing to deliver the killing blow.
At the final moment, the Creeper rammed the blade up under Pumpkinhead's jaw and felt it pass through to the upper jaw. Pumpkinhead dropped the Creeper and reached at his neck, clawing frantically. His mouth was held open by the blade. He stumbled back, and the Creeper did a backflip in which he kicked the hilt of the knife, sealing Pumpkinhead's mouth shut and driving the blade into his brain.
Pumpkinhead stood for another moment, then fell backwards on the ground, dead. After a brief moment of triumph, the Creeper felt something heavy on his back, and he looked over his shoulder to see Freddy holding onto him, his index-claw pointed toward Jason.
The Creeper flew toward Jason. "Hey!" Freddy yelled just before they impacted Jason. The Creeper sank his claws into Jason's shoulders as he carried him off into the sky. Freddy laughed furiously as they gained height. Once they were high enough, Freddy gave the signal and the Creeper released Jason. After a moment of watching him fall, they sped back toward the battle.
Author's Notes: Yep, the Creeper fought and killed Pumpkinhead. Of course, Pumpkinhead's a freakin' demon, so of course he's alive back in Hell. Don't think you know what's going to happen yet, because I don't even know. I just think it and write it.