Cthugha resembles a giant ball of fire. He is served by the Flame Creatures of Cthugha. Fthaggua, regent of the fire vampires, may be his progeny. He has at least one other known progeny, the being known as Aphoom Zhah.
Cthugha is one of the Great Old Ones, and he is also an elemental spirit of fire opposed to the Elder Gods who are enemies of both the Great Old Ones and the Outer Gods.