The image of the Heathcliffe, whether he's Gypsy or Creole, is the main in the novel. In the early childhood, he was supposedly picked up by vernacular of the Earnscho family on Liverpool Street (which in the 18th-19th centuries was one of the largest centers of the Atlantic slave trade in Europe) and adopted into the family. The researchers regard him as "demonic figure" - the embodiment of the power of natural elements, the power of the elemental world, in no way connected with human ethics and morality, forces that resemble the natural power of the heroes of Byron's poems.
Heathcliff in the Essays