The Dwarf is a fictional demon in the prime reality of the Marvel universe of Marvel Comics. Which was created in 1992 by Chris Cooper and Richard Case, first appearing in issue #28 of the 3rd volume of Ghost Rider.
The Dwarf is a demon which serves Chthon, one of the Old Ones. It delivers pages of the Darkhold in black envelopes to people, sometimes giving them little to inkling of what it contains or what it's for and other times promising much if they use the page.
It can magically transport himself to anywhere it wants. Usually appearing wherever a Darkhold page is found. To get people to use a Darkhold page and thereby damn their souls, he influences them. The Dwarf prefers manipulating others to directly attacking them.