I'd imagine as long as its obvious and not mean-spirited/intentionally malicious, it'd be ok/tolerated. The line could be when you get them saying "the n word" or trying to pass it off as actually them.Maybe not right away, but it is definitely in the 'fuck around and find out' territory, especially the quote above of the youtube channel doing it with a person's image. Seems like a great way to find yourself getting sued, especially since Cover and Anycolor are cracking down on people.