Heathcliff from Wuthering Heightsdefinitely falls into the dark 'anti-hero' category. Like Edward Rochester from Jane Eyre, Heathcliff embodies the typical sort of "bad-boy" persona that women (particularly Catherine) find so appealing. His brooding, darkly handsome, tortured persona makes Heathcliff one of the most recognizable romantic heroes of all time. There's just one small problem. Heathcliff can be, and for most of the novel is, a total jerk.
Heathcliff has a violent streak. One only need look at what he named his dogs (Throttler, Skulker...) to see that Heathcliff's passions have dark, untenable roots. He is completely unsympathetic to his family member as portrayed in this disturbing scene:
[Heathcliff] seized, and thrust [Isabella] from the room; and returned muttering – "I have no pity! I have no pity! The more the worms writhe, the more I yearn to crush out their entrails! It is a moral teething; and I grind with greater energy in proportion to the increase of pain." (Chapter 14).
Despite all this, Heathcliff remains a sympathetic character; knowing in the end that he finds his soul mate, only to have her marry someone else.