I've seen plenty of porn out there with lookalike models. Whether that model is a living breathing person or a virtual persona is irrelevant. If you don't identify the individual as the person it looks like, there's not a thing they can do. If you do something that distinguishes them as them, even if it's not verbally naming them, then you canget into trouble. Parody allows you to use it to poke fun at them, but parody doesn't work unless they are found to be 'in the public eye'. You can't do this to make fun of your boss's ex-wife, unless, of course, your boss is Donald Trump (and the ex-wife is Ivana), for instance. As a note, the judge or jury not finding it funny doesn't make it not parody.