Xizor seems very Count Dracula to me. He's an evil, reptilian royal who puts on a facade of being accomodating to his guests, and then turns on them. He tries to seduce Leia (Mina). Luke would be sort of the Jonathan Harker since Han isn't present. Vader would be the Van Helsing who sees Xizor for what he is, outmanuevers his schemes, and eventually destroys him.
It's sketchy, but I do see more than passing similarities. After I know more, I might do a compare/contrast.