Ancient Demon-type Mutant Leader: Red Devil

Red Devil Azazel, an old monster who had kept a low profile for thousands of years. Many people only knew that he had lived for a very, very long time. They merely assumed the X-Gene in his body was unusually miraculous and had life-extending effects. Though extended lifespans were not common among Mutants, there were many examples. Mystique, for instance, was still lurking within the Sky Eye Society, disguised as someone unknown.