Dormammu is a powerful mystical villain from Marvel Comics who appears in Marvel vs. Capcom as a major supernatural threat. He is the ruler of the Dark Dimension, a realm of chaos and dark magic, and is known for his immense magical power, towering presence, and desire to conquer other worlds. In the game series, he serves as an imposing boss-like antagonist and a representative of occult forces, often acting as one of the most dangerous enemies the heroes must face.