I'm not sure what he is. He's probably more a Marxist than a Hegelian, but I think this is more a statistical anomaly of what views he happens to espouse at given moments than reflecting any deep, consistent philosophical schema.
Is he Hegelian? Is so, how exactly is it possible to be a Marxist, and a Hegelian at once ?
Zizek is a loopy but entertaining academic who occasionally has interesting ideas. He's a postmodernist insofar as he's inconsistent and disingenuous but intellectually creative, so, I guess he's very much a postmodernist.
Are you a postmodernist? Is Zizek one? I don't mean to use that as an insult, but it's just something I occasionally hear (that Zizek is one).