Null (Teenage Mutant Ninja Turtles)
Null was a minor demon, who sought to increase his power through the commission of evil deeds on Earth. At first, he looked like a normal human fond of cigars, save for the small horns on his head. He set himself up as a wealthy businessman, and dumped nuclear wastes into the oceanic world of the glublub people. Calling it his Deepdump operation, he left the running of it to his flunkie, Kid Terra. Deepdump was stopped by the Teenage Mutant Ninja Turtles and Man Ray.
Later, he allied himself with an alien race known as the Malignoids, aiding them in their attempt to conquer Earth. When this was foiled by the Mighty Mutanimals, Null escaped, and made a new alliance with the Four Horsemen of the Apocalypse, hoping to bring about the world's end- his misdeeds during this grew him a tail and bat-like wings. When the combined forces of the Turtles and the Mutanimals defeated the Horsemen, Null flew off using his wings.
He only clashed with them one more time when he killed the Mutanimals. In the process he aligned with Maligna again, and ended up flying into the sun with her and Slash. It seems that was the end of him.