I've never been a fan of Dark Knight, but I've always absolutely loved Red Mage, so I'd be really happy if it was brought into the game sometime. I'm not usually a fan of playing mage classes, but I'd play the hell out of Red Mage if it was added.

Though if it's a choice between a class with dual pistols/guns in general and a Red Mage... I'd have to go with the pistols.