But dude, thats the point about fanart, we can go against logic and plot of a series or anything. I mean, your interpretation about sword girls is awesome. Thats not canon, but you are bringing a new idea and concept that neither I expected. So, even if the series is fucked as you said and does not make changes to do a proper fanart, we can twist or manipulate the ideas. Like saying again, Katilda, she is just like a normal cat, but in my point of view, I would like to make her with such a big butt and a fish.
Why hentai exists? Because thats something we expect and we love since its a version we'll never see officially. So, why get stucked in the original concept when we can create a lot of new things. Like saying when a character dies, even dead, we still bring fanart, ecchi, even hentai, because its not what the series decides, but what we like and want.