if Sylph and Maid are the Create classes, then could they create things from, basically, thin air? There'd be some aspect personalized flashiness to it, of course, like a Sylph/Maid of Light would probably create things in a flash of light, Void would likely be a sudden absence before something appears, breath would probably be like wind/air solidifying into the thing, blood would probably be like, a pool of blood coming from somewhere and becoming the object, so on and so forth

Depends on who they’d be, but yes, creation out of thin air could most definitely be a thing.