passingbutchcharacteroftheday was a thing on Tumblr for a hot second, but it's deactivated now and I don't remember if it was mostly "this would legit be interesting" or mostly a gag. Google suggests that some of them were Mako from Korra, Luke Skywalker from Star Wars, Marco Diaz from SVTFOE, Eddie from Rocky Horror, Sam from Holes, and, Jack from Titanic, so probably at least semi-seriously suggesting it would be nifty to think of these characters as women?