Azazel(X-Men)

Azazel is an ancient demon/mutant who claims he is one of the oldest mutants in existence. He is the father of Nightcrawler (of X-Men), Genoshan Mutate/Neyaphem Abyss, and Maori mutant Kiwi Black. Azazel commands the Neyaphem (demonic appearing ancient mutants who inhabit the Brimstone Dimension) as well as the Calcabrina, a witch who harvests souls for him. Azazel claims he fought Mephisto (among others) over the title "Satan".