Demogoblin was originally an unnamed demon who inhabited Limbo and was banished there eons ago for unknown reasons.

He battled Spider-Man, Venom, Iron Fist, Captain America, Deathlok, Cloak and Dagger, and Firestar.

He ultimately becomes repulsed by his comrades' internal feuding and decides to leave them, but he is apprehended by the collective of superheroes before he can make good on this decision.

[11] He is summoned to San Francisco by a horde of goblins who hold the city in their grip and intend to make Demogoblin their ruler.

He has a magical ability to mentally control and levitate his one-man miniature "goblin glider" composed of hellfire and propel it at high speeds.

Apart from his physical and magical advantages, he is knowledgeable about military training and hand-to-hand combat absorbed from his time merged with the Hobgoblin.

In Ultimate Marvel universe, Mary Jane Watson becomes the Demogoblin, after being kidnapped from her bedroom by a facially disfigured clone of Peter Parker who is determined to give her powers so that she is no longer in danger from his enemies.

He pumps in her bloodstream an unquantified amount of OZ, the drug responsible for the creation of the Green Goblin, Hobgoblin and also Spider-Man.

[18] She is then given what is believed to be a cure to the effects of the OZ formula, yet the ordeal has left her badly traumatized, and she is shown to be affected by panic issues and haunted by the scarred visage of Peter's disfigured clone.