What do we know about Vanitas? He has to be a doppelganger of an already existing character because otherwise there is no point in hiding his face. Unfortunately, none of the original characters to date have bushy eyebrows. Regardless, I still believe he looks like Ven. There's plenty of evidence that the two are related, most obviously by their names. Nomura blatenly ammited that he picked the name Vanitas because it sounds like Ventus. The only reason we even know Vanitas's hair and eye color is his helmet melts in Ven's presence. I think Vanitas is a black haired bushy browed "Ven" that's probably related to Ven's darkness.