Something that has ALWAYS bothered me is that BB's fruit is NOT a Logia! Yeah, he can create infinite amounts of darkness, he can manipulate the darkness, but he cannot become the darkness. If BB is a logia, so is Mr. 3. Sorry if this has already been discussed but I'm not searching through 43 pages to find it. If anyone has any explanations for this I'd be grateful to hear them.
I think it is because Logias grant power over nature and the elements like light fire or darkness. The word logia comes from Nature. Even though BB can't become darkness his fruit is still a logia because he has power over a natural element.
Wax, poison, rubber, soap and those kind of things are more like man-made creations, not natural elements so they are paramecias