I don't really know how to consider this.. Final Fantasy and non-Final Fantasy related?
But is it possible to add Culex, a boss from Super Mario RPG, to FFXIV? I was having a nostalgia moment listening to the Super Mario RPG sound track and it reminded me of the boss fight with Culex. I did some research on him and he was never considered a boss in the Final Fantasy series, he was also considered a Dark Knight working under a Dark Mage (Assuming a BLM.)
I know Super Mario RPG was developed by Squaresoft, published by Nintendo. (I honestly don't know how it works) But it would be nice to add a boss that was a reference to Final Fantasy since it did have the FFIV boss theme and FF victory fanfare AND the main theme after defeating him.